Empaveli

6 ADVERSE REACTIONS The following clinically significant adverse reactions are discussed in greater detail in other sections of the labeling: Serious Infections Caused by Encapsulated Bacteria [see Warnings and Precautions (5.1) ] Infusion-Related Reactions [see Warnings and Precautions (5.3) ] Most common adverse reactions in patients with PNH (incidence ≥10%) were injection-site reactions, infections, diarrhea, abdominal pain, respiratory tract infection, pain in extremity, hypokalemia, fatigue, viral infection, cough, arthralgia, dizziness, headache, and rash. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Apellis Pharmaceuticals, Inc. at 1-833-866-3346 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Paroxysmal Nocturnal Hemoglobinuria Study in Complement-Inhibitor Experienced Adult Patients with PNH (Study APL2-302) The data described below reflect the exposure in 80 adult patients with PNH who received EMPAVELI (n=41) or eculizumab (n=39) at the recommended dosing regimens for 16 weeks. Serious adverse reactions were reported in 7 (17%) patients with PNH receiving EMPAVELI. The most common serious adverse reaction in patients treated with EMPAVELI was infections (5%). The most common adverse reactions (≥10%) with EMPAVELI were injection-site reactions, infections, diarrhea, abdominal pain, respiratory tract infection, viral infection, and fatigue. Table 1 describes the adverse reactions that occurred in ≥5% of patients treated with EMPAVELI in Study APL2-302. Table 1: Adverse Reactions Reported in ≥5% of Patients Treated with EMPAVELI in Study APL2-302 Adverse Reaction EMPAVELI (N=41) n (%) Eculizumab (N=39) n (%) General disorders and administration site conditions Injection-site reaction The following terms were combined: Abdominal pain includes: abdominal pain upper, abdominal discomfort, abdominal pain, abdominal pain lower, abdominal tenderness, epigastric discomfort Back pain includes: back pain, sciatica Chest pain includes: chest discomfort, non-cardiac chest pain, musculoskeletal chest pain, chest pain Fatigue includes: asthenia, lethargy, fatigue Infections include: oral herpes, bacterial infection, fungal infection, gastrointestinal infection, gastrointestinal viral infection, influenza-like illness, nasopharyngitis, pulpitis dental, rhinitis, tonsillitis, tonsillitis bacterial, vulvovaginal mycotic infection, hordeolum, sepsis, furuncle, otitis externa, viral respiratory tract infection, gastroenteritis, upper respiratory tract infection, bronchitis, ear infection, respiratory tract infection, rhinovirus infection, sinusitis, urinary tract infection Injection-site reaction includes: injection-site erythema, injection-site reaction, injection-site swelling, injection-site induration, injection-site bruising, injection-site pain, injection-site pruritus, vaccination-site reaction, administration-site swelling, injection-site hemorrhage, injection-site edema, injection-site warmth, administration-site pain, application-site pain, injection-site mass, injection-site rash, vaccination-site pain Respiratory tract infection includes: influenza-like illness, nasopharyngitis, rhinitis, tonsillitis, viral upper respiratory tract infection, upper respiratory tract infection, respiratory tract infection, sinusitis Systemic hypertension includes: hypertension Viral infection includes: oral herpes, gastrointestinal viral infection, viral upper respiratory tract infection, rhinovirus infection 16 (39) 2 (5) Fatigue 5 (12) 9 (23) Chest pain 3 (7) 1 (3) Infections and infestations Infections 12 (29) 10 (26) Respiratory tract infection 6 (15) 5 (13) Viral Infection 5 (12) 3 (8) Gastrointestinal disorders Diarrhea 9 (22) 1 (3) Abdominal pain 8 (20) 4 (10) Musculoskeletal disorders Back pain 3 (7) 4 (10) Nervous system disorders Headache 3 (7) 9 (23) Vascular disorders Systemic hypertension 3 (7) 1 (3) Clinically relevant adverse reactions in less than 5% of patients include: Intestinal ischemia Biliary sepsis Hypersensitivity pneumonitis After the randomized control period, 77 patients continued the study, and all were treated with EMPAVELI monotherapy at the recommended dosing regimen for up to 48 weeks. Serious adverse reactions were reported in 18 patients (23%). Additional adverse reactions reported in >5% of patients treated with EMPAVELI during the open-label part of the study compared to the randomized controlled part in Table 1 were cough (12%), arthralgia (8%), oropharyngeal pain (8%), pyrexia (8%), pain in extremity (7%), thrombocytopenia (7%), abdominal distension (5%), acute kidney injury (5%), anxiety (5%), and myalgia (5%). One patient (1%) died due to COVID-19 infection. Description of Select Adverse Reactions Injection-Site Reactions Injection/infusion-site reactions (e.g., erythema, swelling, induration, pruritis, and pain) have been reported during Study APL2-302. These reactions were mild or moderate in severity. Diarrhea Seventeen cases of diarrhea have been reported during the 48 weeks. Fifteen of the cases were mild and two were moderate. Study in Complement-Inhibitor Naïve Adult Patients with PNH (Study APL2-308) The data described below reflect the exposure in adult patients with PNH who received EMPAVELI (n=46) or the control arm (supportive care excluding complement inhibitors) (n=18) in Study APL2-308 [see Clinical Studies (14.1) ] . One patient (2%) who received EMPAVELI died due to septic shock. Serious adverse reactions were reported in 6 (13%) patients with PNH receiving EMPAVELI. The most common adverse reaction (≥10%) in patients treated with EMPAVELI were injection site reactions, infections, viral infection, pain in extremity, hypokalemia, arthralgia, dizziness, abdominal pain, rash, and headache. Table 2 describes the adverse reactions that occurred in ≥5% of patients treated with EMPAVELI in Study APL2‑308. Table 2: Adverse Reactions Reported in ≥5% of Patients Treated with EMPAVELI in Study APL2-308 Adverse Reaction EMPAVELI (N=46) n (%) Control Arm Control Arm = supportive care (excluding complement inhibitors) (N=18) n (%) Exposure Adjusted Rate (per 100 pt yrs) Exposure Adjusted Rate (per 100 pt yrs) EMPAVELI (N=46) group includes patients who received EMPAVELI at any point during the study, including patients randomized to EMPAVELI (N=35) and patients randomized to the control arm and crossed over to EMPAVELI treatment (N=11). General disorders and administration site conditions Injection-site reaction The following terms were combined: Infections include : acne pustular, anal abscess, cellulitis, gastroenteritis, helicobacter gastritis, hordeolum, nasopharyngitis, esophageal candidiasis, pharyngitis, septic shock, tuberculosis, upper respiratory tract infection, urinary tract infection enterococcal, vaginal infection, pneumocystitis jirovecii pneumonia, pulmonary tuberculosis, urinary tract infection Abdominal pain includes: abdominal pain, abdominal pain upper. Injection site reaction includes: injection site bruising, injection site hemorrhage, injection site swelling, application site reaction, infusion site pruritus, injection site erythema, injection site rash, puncture site reaction. Viral infection includes : viral infection, covid-19, covid-19 pneumonia, coronavirus test positive, herpes virus, influenza Peripheral edema includes : peripheral swelling, edema peripheral Headache includes : headache, migraine Rash includes : rash, maculo-papular rash, dermatitis Cough includes : cough, allergic cough 12 (26) 42 0 0 Pyrexia 4(9) 14 0 0 Peripheral edema 3 (7) 11 0 0 Infections and Infestations Infections 9 (20) 32 4 (22) 74 Viral infection 6 (13) 21 2 (11) 37 Musculoskeletal and connective tissue disorders Pain in extremity 6 (13) 21 0 0 Arthralgia 5 (11) 18 0 0 Musculoskeletal pain 3 (7) 11 0 0 Metabolism and nutrition disorders Hypokalemia 6 (13) 21 2 (11) 37 Nervous system disorders Dizziness 5 (11) 18 0 0 Headache 5 (11) 18 0 0 Somnolence 3 (7) 11 0 0 Gastrointestinal disorders Abdominal pain 5 (11) 18 1 (6) 18 Skin and subcutaneous tissue disorders Rash 5(11) 18 0 0 Ecchymosis 3 (7) 11 0 0 Erythema 3 (7) 11 0 0 Blood and lymphatic system disorders Thrombocytopenia 3 (7) 11 1 (6) 18 Respiratory, thoracic and mediastinal disorders Cough 4 (9) 14 0 0 Epistaxis 3 (7) 11 0 0 Investigations Blood creatinine increased 3 (7) 11 0 0

4 CONTRAINDICATIONS EMPAVELI is contraindicated in: Patients with hypersensitivity to pegcetacoplan or to any of the excipients. Patients who are not currently vaccinated against certain encapsulated bacteria, unless the risks of delaying EMPAVELI treatment outweigh the risks of developing a bacterial infection with an encapsulated organism [see Warnings and Precautions (5.1) ] . Patients with unresolved serious infection caused by encapsulated bacteria including Streptococcus pneumoniae , Neisseria meningitidis , and Haemophilus influenzae . EMPAVELI is contraindicated in: Patients with hypersensitivity to pegcetacoplan or any of the excipients. ( 4 ) Patients who are not currently vaccinated against certain encapsulated bacteria unless the risks of delaying EMPAVELI treatment outweigh the risks of developing a serious bacterial infection with an encapsulated organism. ( 4 , 5.1 ) Patients with unresolved serious infection caused by encapsulated bacteria. ( 4 )

11 DESCRIPTION EMPAVELI contains pegcetacoplan, a complement inhibitor. Pegcetacoplan is a symmetrical molecule comprised of two identical pentadecapeptides covalently bound to the ends of a linear 40-kiloDalton (kDa) PEG molecule. The peptide portions of pegcetacoplan contain 1-methyl-L-tryptophan (Trp(Me)) in position 4 and amino(ethoxyethoxy)acetic acid (AEEA) in position 14. The molecular weight of pegcetacoplan is approximately 43.5 kDa. The molecular formula is C 1970 H 3848 N 50 O 947 S 4 . The structure of pegcetacoplan is shown below. EMPAVELI injection is a sterile, clear, colorless to slightly yellowish aqueous solution for subcutaneous use and is supplied in a 20-mL single-dose vial. Each 1 mL of solution contains 54 mg of pegcetacoplan, 41 mg of sorbitol, 0.384 mg of glacial acetic acid, 0.490 mg of sodium acetate trihydrate, and Water for Injection USP. EMPAVELI may also contain sodium hydroxide and/or additional glacial acetic acid for adjustment to a target pH of 5.0. Chemical Structure

2 DOSAGE AND ADMINISTRATION Recommended dosage is 1,080 mg administered subcutaneously twice weekly. ( 2.2 ) EMPAVELI can be administered via a commercially available pump or with EMPAVELI Injector. ( 2.2 , 2.3 ) See Full Prescribing Information for instructions on preparation and administration. ( 2.2 , 2.3 ) 2.1 Recommended Vaccination and Prophylaxis Vaccinate patients against encapsulated bacteria, including Streptococcus pneumoniae , Neisseria meningitidis , and Haemophilus influenzae type B at least 2 weeks prior to initiation of EMPAVELI therapy according to current ACIP guidelines [see Warnings and Precautions (5.1) ] . Provide 2 weeks of antibacterial drug prophylaxis to patients if EMPAVELI must be initiated immediately and vaccines are administered less than 2 weeks before starting therapy with EMPAVELI. Healthcare professionals who prescribe EMPAVELI must enroll in the REMS for EMPAVELI [see Warnings and Precautions (5.2) ] . 2.2 Dosage The recommended dose of EMPAVELI is 1,080 mg administered subcutaneously twice weekly. EMPAVELI can be administered via a commercially available infusion pump with a reservoir of at least 20 mL or with EMPAVELI Injector. Dosage for patients switching to EMPAVELI from C5 inhibitors To reduce the risk of hemolysis with abrupt treatment discontinuation: For patients switching from eculizumab, initiate EMPAVELI while continuing eculizumab at its current dose. After 4 weeks, discontinue eculizumab before continuing on monotherapy with EMPAVELI. For patients switching from ravulizumab, initiate EMPAVELI no more than 4 weeks after the last dose of ravulizumab. Dose Adjustment For lactate dehydrogenase (LDH) levels greater than 2 × the upper limit of normal (ULN), adjust the dosing regimen to 1,080 mg every three days. In the event of a dose increase, monitor LDH twice weekly for at least 4 weeks. Missed Dose Administer EMPAVELI as soon as possible after a missed dose. Resume the regular dosing schedule following administration of the missed dose. 2.3 Administration EMPAVELI is for subcutaneous administration using: an infusion pump OR EMPAVELI Injector, a single-use, disposable on body injector EMPAVELI is intended for use under the guidance of a healthcare professional. Train patients and/or caregivers on how to prepare and administer EMPAVELI prior to use. After proper training a patient may self-administer, or the patient's caregiver may administer EMPAVELI, if a healthcare provider determines that it is appropriate. Follow the steps below and use aseptic technique to prepare and administer EMPAVELI, either by an infusion pump or EMPAVELI Injector: Prior to use‚ allow EMPAVELI to reach room temperature for approximately 30 minutes. Keep the vial in the carton until ready for use to protect from light. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. EMPAVELI is a clear, colorless to slightly yellowish solution. Do not use if the liquid looks cloudy, contains particles, or is dark yellow. Discard any unused portion of EMPAVELI. Preparation with Infusion Pump Refer to the EMPAVELI Instructions for Use and the infusion pump manufacturer's instructions for full preparation and administration information. Use a needleless transfer device (such as a vial adapter) or a transfer needle to fill the syringe. Rotate infusion sites (i.e., abdomen, thighs, hips, upper arms) from one infusion to the next. Do not infuse where the skin is tender, bruised, red, or hard. Avoid infusing into tattoos, scars, or stretch marks. If multi-infusion sets are needed, ensure the infusion sites are at least 3 inches apart. The typical infusion time is approximately 30 minutes (if using two infusion sites) or approximately 60 minutes (if using one infusion site). Preparation with EMPAVELI Injector Refer to the EMPAVELI Injector Instructions for Use, which comes with the device. Use a needleless transfer device (such as a vial adapter). EMPAVELI Injector is for abdominal subcutaneous use only. Rotate the site of each subcutaneous administration. Do not inject where the skin is tender, bruised, red, or hard. Avoid injecting into tattoos, scars, or stretch marks. Injection time is approximately 30 to 60 minutes.

1 INDICATIONS AND USAGE EMPAVELI ® is indicated for the treatment of adult patients with paroxysmal nocturnal hemoglobinuria (PNH). EMPAVELI is a complement inhibitor indicated for the treatment of adult patients with paroxysmal nocturnal hemoglobinuria (PNH). ( 1 )

12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Pegcetacoplan binds to complement protein C3 and its activation fragment C3b, thereby regulating the cleavage of C3 and the generation of downstream effectors of complement activation. In PNH, extravascular hemolysis (EVH) is facilitated by C3b opsonization while intravascular hemolysis (IVH) is mediated by the downstream membrane attack complex (MAC). Pegcetacoplan acts proximally in the complement cascade controlling both C3b-mediated EVH and terminal complement-mediated IVH. 12.2 Pharmacodynamics In patients with PNH administered multiple doses of pegcetacoplan, the mean C3 concentration increased from 0.94 g/L at baseline to 3.80 g/L at Week 16 and sustained through Week 48 (Study APL2-302). In study APL2-308, the mean C3 concentration increased from 0.95 g/L at baseline to 3.56 g/L at Week 26 [see Clinical Studies (14.1) ] . The percentage of PNH Type II + III RBCs increased from 66.2% at baseline to 93.9% at Week 16 and sustained through Week 48 (Study APL2-302). In Study APL2-308, the mean percentage of PNH Type II + III RBCs increased from 42.4% at baseline to 90.0% at Week 26. The mean percentage of PNH Type II + III RBCs with C3 deposition decreased from 17.8% at baseline to 0.20% at Week 16 and sustained through Week 48 (Study APL2-302). In Study APL2-308, the mean percentage of PNH Type II + III RBCs with C3 deposition decreased from 2.85% at baseline to 0.09% at Week 26. Cardiac Electrophysiology At the recommended dose of EMPAVELI, no large mean increases in QTc interval (i.e., greater than 20 msec) were observed. 12.3 Pharmacokinetics In patients with PNH, the serum pegcetacoplan concentrations achieved steady-state approximately 4 to 6 weeks following the first dose. The exposure of pegcetacoplan increased proportionally over a dose range from 45 to 1,440 mg (0.04 to 1.33 times the approved recommended dose). The mean (CV%) trough serum concentration observed at Week 16 was 706 (15.1%) mcg/mL and sustained through Week 48 (Study APL2-302). In Study APL2-308, mean (CV%) trough serum concentration was 744 (25.5%) mcg/mL at Week 26. Absorption The median T max of pegcetacoplan is between 108 and 144 hours (4.5 to 6.0 days) after a single dose. Distribution The mean (CV%) volume of distribution of pegcetacoplan is approximately 3.98 L (32%) in patients with PNH. Elimination The estimated mean (CV%) of clearance (CL) is 0.36 L/day (30%) and median effective half-life of elimination (t 1/2 ) is 8.6 days in patients with PNH. Metabolism Pegcetacoplan is expected to be metabolized into small peptides and amino acids by catabolic pathways. Specific Populations There were no clinically significant differences on the pharmacokinetics of pegcetacoplan based on age (19 to 81 years old), sex, race (Asian vs. non-Asian), renal impairment, and hepatic function as evaluated by total bilirubin (0.06-8.8 mg/dL), albumin (3.0-5.5 g/dL), aspartate aminotransferase (6.0-302 IU/L), or alanine aminotransferase (4.0-209 IU/L). 12.6 Immunogenicity There is insufficient information to characterize the anti-drug antibody response to EMPAVELI and the effects of anti-drug antibodies on pharmacokinetics, pharmacodynamics, safety, or effectiveness of pegcetacoplan products.

12.1 Mechanism of Action Pegcetacoplan binds to complement protein C3 and its activation fragment C3b, thereby regulating the cleavage of C3 and the generation of downstream effectors of complement activation. In PNH, extravascular hemolysis (EVH) is facilitated by C3b opsonization while intravascular hemolysis (IVH) is mediated by the downstream membrane attack complex (MAC). Pegcetacoplan acts proximally in the complement cascade controlling both C3b-mediated EVH and terminal complement-mediated IVH.

12.2 Pharmacodynamics In patients with PNH administered multiple doses of pegcetacoplan, the mean C3 concentration increased from 0.94 g/L at baseline to 3.80 g/L at Week 16 and sustained through Week 48 (Study APL2-302). In study APL2-308, the mean C3 concentration increased from 0.95 g/L at baseline to 3.56 g/L at Week 26 [see Clinical Studies (14.1) ] . The percentage of PNH Type II + III RBCs increased from 66.2% at baseline to 93.9% at Week 16 and sustained through Week 48 (Study APL2-302). In Study APL2-308, the mean percentage of PNH Type II + III RBCs increased from 42.4% at baseline to 90.0% at Week 26. The mean percentage of PNH Type II + III RBCs with C3 deposition decreased from 17.8% at baseline to 0.20% at Week 16 and sustained through Week 48 (Study APL2-302). In Study APL2-308, the mean percentage of PNH Type II + III RBCs with C3 deposition decreased from 2.85% at baseline to 0.09% at Week 26. Cardiac Electrophysiology At the recommended dose of EMPAVELI, no large mean increases in QTc interval (i.e., greater than 20 msec) were observed.

12.3 Pharmacokinetics In patients with PNH, the serum pegcetacoplan concentrations achieved steady-state approximately 4 to 6 weeks following the first dose. The exposure of pegcetacoplan increased proportionally over a dose range from 45 to 1,440 mg (0.04 to 1.33 times the approved recommended dose). The mean (CV%) trough serum concentration observed at Week 16 was 706 (15.1%) mcg/mL and sustained through Week 48 (Study APL2-302). In Study APL2-308, mean (CV%) trough serum concentration was 744 (25.5%) mcg/mL at Week 26. Absorption The median T max of pegcetacoplan is between 108 and 144 hours (4.5 to 6.0 days) after a single dose. Distribution The mean (CV%) volume of distribution of pegcetacoplan is approximately 3.98 L (32%) in patients with PNH. Elimination The estimated mean (CV%) of clearance (CL) is 0.36 L/day (30%) and median effective half-life of elimination (t 1/2 ) is 8.6 days in patients with PNH. Metabolism Pegcetacoplan is expected to be metabolized into small peptides and amino acids by catabolic pathways. Specific Populations There were no clinically significant differences on the pharmacokinetics of pegcetacoplan based on age (19 to 81 years old), sex, race (Asian vs. non-Asian), renal impairment, and hepatic function as evaluated by total bilirubin (0.06-8.8 mg/dL), albumin (3.0-5.5 g/dL), aspartate aminotransferase (6.0-302 IU/L), or alanine aminotransferase (4.0-209 IU/L).

20231009

8

3 DOSAGE FORMS AND STRENGTHS Injection: 1,080 mg/20 mL (54 mg/mL) clear, colorless to slightly yellowish solution in a single-dose vial. Injection: 1,080 mg/20 mL (54 mg/mL) in a single-dose vial. ( 3 )

Empaveli Pegcetacoplan Pegcetacoplan Pegcetacoplan SORBITOL ACETIC ACID SODIUM ACETATE SODIUM HYDROXIDE WATER

13.2 Animal Toxicology and/or Pharmacology In toxicology studies in rabbits and cynomolgus monkeys, epithelial vacuolation and infiltrates of vacuolated macrophages were observed in multiple tissues, including the renal tubules, following daily subcutaneous doses of pegcetacoplan up to 7 times the human dose. These findings are attributable to uptake of the PEG moieties of pegcetacoplan. Renal degeneration was observed microscopically in rabbits at exposures (C max and AUC) less than those for the human dose, and in monkeys at exposures approximately 2.7-fold those for the human dose. The clinical significance of these findings is uncertain.

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility Long-term animal carcinogenicity studies of pegcetacoplan have not been conducted. Pegcetacoplan was not mutagenic when tested in an in vitro bacterial reverse mutation (Ames) and was not genotoxic in an in vitro assay in human TK6 cells or in an in vivo micronucleus assay in mice. Effects of pegcetacoplan on fertility have not been studied in animals. There were no microscopic abnormalities in male or female reproductive organs in toxicity studies in rabbits and monkeys.

13 NONCLINICAL TOXICOLOGY 13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility Long-term animal carcinogenicity studies of pegcetacoplan have not been conducted. Pegcetacoplan was not mutagenic when tested in an in vitro bacterial reverse mutation (Ames) and was not genotoxic in an in vitro assay in human TK6 cells or in an in vivo micronucleus assay in mice. Effects of pegcetacoplan on fertility have not been studied in animals. There were no microscopic abnormalities in male or female reproductive organs in toxicity studies in rabbits and monkeys. 13.2 Animal Toxicology and/or Pharmacology In toxicology studies in rabbits and cynomolgus monkeys, epithelial vacuolation and infiltrates of vacuolated macrophages were observed in multiple tissues, including the renal tubules, following daily subcutaneous doses of pegcetacoplan up to 7 times the human dose. These findings are attributable to uptake of the PEG moieties of pegcetacoplan. Renal degeneration was observed microscopically in rabbits at exposures (C max and AUC) less than those for the human dose, and in monkeys at exposures approximately 2.7-fold those for the human dose. The clinical significance of these findings is uncertain.

NDA215014

Empaveli

Pegcetacoplan

73606-010

HUMAN PRESCRIPTION DRUG

SUBCUTANEOUS

PRINCIPAL DISPLAY PANEL - 1,080 mg/20 mL Vial Carton NDC 73606-010-01 EMPAVELI ® (pegcetacoplan) Injection 1,080 mg/20 mL (54 mg/mL) For Subcutaneous Infusion Only Dispense the enclosed Medication Guide to each patient. One 20 mL Single-Dose Vial. Discard unused portion. Rx only Apellis PRINCIPAL DISPLAY PANEL - 1,080 mg/20 mL Vial Carton

Dosage and Administration, Dosage ( 2.2 ) 09/2023 Dosage and Administration, Administration ( 2.3 ) 09/2023

Manufactured for: Apellis Pharmaceuticals, Inc. 100 Fifth Avenue Waltham, MA 02451 For patent information: www.apellis.com/productpatent Copyright © 2021 Apellis Pharmaceuticals, Inc. All rights reserved. EMPAVELI is a registered trademark of Apellis Pharmaceuticals, Inc. EMP-PI-29Sep2023-4.0

17 PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling (Medication Guide and Instructions for Use). Serious Infections Caused by Encapsulated Bacteria Advise patients of the risk of serious infection. Inform patients that they are required to receive vaccinations against encapsulated bacteria at least 2 weeks prior to receiving the first dose of EMPAVELI if they have not been previously vaccinated. They are required to be revaccinated according to current medical guidelines for encapsulated bacteria while on EMPAVELI therapy. Inform patients that vaccination may not prevent serious infection and strongly advise patients to seek immediate medical attention if these signs or symptoms occur. These signs and symptoms include the following: fever with or without shivers or the chills fever and a rash shortness of breath extreme pain or discomfort headache with nausea or vomiting high heart rate headache and a fever headache with a stiff neck or stiff back confusion muscle aches with flu-like symptoms clammy skin eyes sensitive to light Inform patients that they will be given a Patient Safety Card for EMPAVELI that they should carry with them at all times. This card describes symptoms which, if experienced, should prompt the patient to seek immediate medical evaluation. Anaphylaxis and infusion-related reactions Advise patients of the risk of anaphylaxis and infusion-related reactions. Inform patients that anaphylaxis is life-threatening and strongly advise patients to seek immediate medical attention if these signs or symptoms occur. These signs and symptoms include the following: difficulty breathing including shortness of breath and wheezing swollen tongue or throat feeling faint rapid heart rate skin reactions, including hives and itching nausea or vomiting confusion and anxiety dizziness or fainting Discontinuation Inform patients with PNH that they may develop hemolysis due to PNH when EMPAVELI is discontinued and that they will be monitored by their healthcare professional for at least 8 weeks following discontinuation of EMPAVELI. Inform patients who discontinue EMPAVELI to keep the Patient Safety Card with them for 2 months after the last dose of EMPAVELI, because the increased risk of serious infection persists for several weeks following discontinuation of EMPAVELI.

INSTRUCTIONS FOR USE EMPAVELI ® (em-puh-vel-ee) (pegcetacoplan) injection, for subcutaneous use infusion pump Important Information This Instructions for Use is for the infusion pump only. If using EMPAVELI Injector, follow the Instructions for Use that comes with the EMPAVELI Injector. Read this Instructions for Use before you start using EMPAVELI with an infusion pump and each time you get a refill as there may be new information. This information does not take the place of talking to your healthcare provider about your medical condition or treatment. Your healthcare provider should show you or your caregiver how to infuse EMPAVELI the right way before you use it for the first time. Ask your healthcare provider about any instructions you do not understand. How should I store EMPAVELI? Store vials of EMPAVELI in the refrigerator between 36°F to 46°F (2°C to 8°C) in the original carton to protect from light. Do not use EMPAVELI past the expiration date stamped on the carton. Keep EMPAVELI and all medicines out of the reach of children. Step 1 Prepare for infusion Before you start: Find a well-lit, flat work surface area, like a table. Remove a single vial carton from the refrigerator. Keep the vial in the carton at room temperature and allow it to warm up for about 30 minutes. Do not try to speed up the warming process. Gather your supplies (See Figure A ): Infusion pump and manufacturer's instructions (not shown) Compatible syringe for your infusion pump Transfer needle OR Needleless transfer device to draw up the medicine from the vial Infusion set (not shown; varies according to device manufacturer's instructions) Infusion tubing Sharps container Alcohol wipes Gauze and tape, or transparent dressing Figure A: Supplies Clean your work surface well using an alcohol wipe. Wash your hands well with soap and water. Dry your hands. Step 2 Check the vial and liquid Remove the vial from the carton. Carefully look at the liquid in the vial of EMPAVELI. EMPAVELI is a clear, colorless to slightly yellowish liquid. Check for particles or color changes (See Figure B ). Do not use the vial and call ApellisAssist at 1-866-MY-APL-ASSIST (1-866-692-7527) if: The liquid looks cloudy, contains particles, or is dark yellow. The protective flip cap is missing or damaged. The expiration date on the label has passed. Figure B Step 3 Prepare and fill syringe Remove the protective flip cap from the top of the vial to show the middle part of the gray rubber stopper of the EMPAVELI vial (See Figure C ). Throw away the protective flip cap. Clean the gray rubber stopper with a new alcohol wipe and allow the gray rubber stopper to dry for at least 30 seconds. Do not touch the exposed gray rubber stopper after wiping. Figure C Option 1: If using a needleless transfer device (such as a vial adapter), follow the instructions provided by the device manufacturer. OR Option 2: If transfer is done using a transfer needle and a syringe, follow the instructions below: Attach a sterile transfer needle to a sterile syringe. Pull back the plunger to the 20-mL mark to fill the syringe with air (See Figure D ). Push the air-filled syringe with transfer needle attached down through the center of the vial gray rubber stopper. The tip of the transfer needle should not be in the solution to avoid creating air bubble(s) (See Figure E ). Gently push the air from the syringe into the vial. This will inject the air from the syringe into the vial. Figure D Figure E Turn the vial upside down and insert the transfer needle in the EMPAVELI solution (See Figure F ). Figure F With the transfer needle tip in the EMPAVELI solution, slowly pull the plunger back to fill the syringe with all the EMPAVELI solution (See Figure G ). Remove the filled syringe with EMPAVELI and the transfer needle from the vial. Figure G Remove the transfer needle by using 1 hand to slide the needle into the needle cap and scoop upwards to cover the needle (See Figure H ). Figure H After the needle is covered, push the needle cap down towards the syringe to fully attach it with 1 hand to prevent an accidental stick with the needle (See Figure I ). Figure I Twist off and remove the transfer needle (See Figure J ). Figure J Step 4 Prepare infusion pump and tubing Gather the infusion pump supplies and follow the device manufacturer's instructions to prepare the pump and tubing. Step 5 Prepare the infusion site(s) Select an area on your stomach (abdomen), thighs, hips, or upper arms for the infusion(s) (See Figure K ). Avoid the following infusion areas: Do not infuse into areas where the skin is tender, bruised, red, or hard. Avoid infusing into tattoos, scars, or stretch marks. Figure K Use a different site(s) from the last time you infused EMPAVELI. If there are multiple infusion sites, they should be at least 3 inches apart. Change (rotate) infusion sites in between each infusion (See Figure L ). Figure L Clean the skin at each infusion site(s) with a new alcohol wipe, starting at the center of each infusion site and working outward in a circular motion (See Figure M ). Let the skin dry. Figure M Step 6 Insert and secure the infusion needle(s) Pinch the skin between your thumb and forefinger around the infusion site (where you plan to insert the needle). Insert the needle into the skin (See Figure N ). Figure N Secure the needle(s) using gauze and tape or a transparent dressing placed over the infusion site(s) (See Figure O ). Figure O Step 7 Start infusion Follow the device manufacturer's instructions to start the infusion. Start the infusion right away after drawing EMPAVELI into the syringe. EMPAVELI infusion takes about 30 minutes (if using 2 infusion sites) or about 60 minutes (if using 1 infusion site) to complete. Step 8 Complete infusion Follow the device manufacturer's instructions to complete the infusion. Step 9 Record infusion Record your treatment as directed by your healthcare provider. Step 10 Clean up After the infusion is complete, remove the dressing and slowly take out the needle(s). Cover the infusion site with a new dressing. Remove the infusion set from the pump and throw it away into the sharps container (See Figure P ). Clean and store the infusion pump according to the device manufacturer's instructions. Step 11 Dispose of (throw away) used needles and syringes and EMPAVELI infusion tubing. Put the used needles, syringes, and EMPAVELI infusion tubing in an FDA-cleared sharps disposal container right away after use (See Figure P ). Do not dispose of (throw away) the used needles, syringes, and EMPAVELI infusion tubing in your household trash. If you do not have an FDA-cleared sharps disposal container, you may use a household container that is: made of heavy-duty plastic, can be closed with a tight-fitting, puncture-resistant lid, without sharps being able to come out, upright and stable during use, leak-resistant, and properly labeled to warn of hazardous waste inside the container. When your sharps disposal container is almost full, you will need to follow your community guidelines for the right way to dispose of your sharps disposal container. There may be state or local laws about how you should throw away used needles and syringes. For more information about safe sharps disposal, and for specific information about sharps disposal in the state that you live in, go to the FDA's website at: http://www.fda.gov/safesharpsdisposal. Do not throw away your used sharps disposal container in your household trash unless your community guidelines permit this. Do not recycle your used sharps disposal container. Figure P Call 1-866-692-7527 to speak with an Apellis representative. Manufactured for: Apellis Pharmaceuticals, Inc. 100 Fifth Avenue Waltham, MA 02451 Copyright © 2021 Apellis Pharmaceuticals, Inc. All rights reserved. EMPAVELI is a registered trademark of Apellis Pharmaceuticals, Inc. This Instructions for Use has been approved by the U.S. Food and Drug Administration. Revised 09/2023 EMP-IFU-29Sep2023-4.0 Figure A Figure B Figure C Figure D Figure E Figure F Figure G Figure H Figure I Figure J Figure K Figure L Figure M Figure N Figure O Figure P

This Medication Guide has been approved by the U.S. Food and Drug Administration. Revised 09/2023 MEDICATION GUIDE EMPAVELI ® (em-puh-vel-ee) (pegcetacoplan) injection, for subcutaneous use What is the most important information I should know about EMPAVELI? EMPAVELI is a medicine that can affect your immune system. EMPAVELI can lower the ability of your immune system to fight infections. EMPAVELI may increase your chance of getting serious and life-threatening meningococcal infections. Meningococcal infections may quickly become life-threatening and cause death if not recognized and treated early. EMPAVELI may also increase the risk of getting serious infections. People who take EMPAVELI may have an increased risk of getting infections caused by Streptococcus pneumoniae , Neisseria meningitidis , and Haemophilus influenzae type B. Serious infections may quickly become life-threatening and cause death if not recognized and treated early. You must be vaccinated against these bacteria at least 2 weeks before your first dose of EMPAVELI if you have not already had these vaccines. If your healthcare provider decides that urgent treatment with EMPAVELI is needed, you should receive the required vaccinations as soon as possible. If you have not been vaccinated and EMPAVELI therapy must be initiated immediately, you should also receive 2 weeks of antibiotics with your vaccinations. If you have been vaccinated against these bacteria in the past, you might need additional vaccinations before starting EMPAVELI. Your healthcare provider will decide if you need additional vaccinations. Vaccines reduce the risk of serious infections, but do not prevent all serious infections. Call your healthcare provider or get emergency medical care right away if you get any of these signs and symptoms of a serious infection: fever with or without shivers or the chills fever and a rash shortness of breath extreme pain or discomfort headache with nausea or vomiting high heart rate headache and a fever headache with a stiff neck or stiff back confusion muscle aches with flu-like symptoms clammy skin eyes sensitive to light Your healthcare provider will give you a Patient Safety Card about the risk of serious infections. Carry it with you at all times during treatment and for 2 months after your last EMPAVELI dose. Your risk of serious infections may continue for several weeks after your last dose of EMPAVELI. It is important to show this card to any healthcare provider who treats you. This will help them diagnose and treat you quickly. EMPAVELI is only available through a program called the EMPAVELI REMS. Before you can take EMPAVELI, your healthcare provider must: enroll in the EMPAVELI REMS program. counsel you about the risk of serious infections caused by certain bacteria. give you information about the symptoms of serious infections. give you a Patient Safety Card about your risk of serious infections, as discussed above. make sure that you are vaccinated. What is EMPAVELI? EMPAVELI is a prescription medicine used to treat adults with a disease called paroxysmal nocturnal hemoglobinuria (PNH). It is not known if EMPAVELI is safe and effective in children. Do not take EMPAVELI if you: are allergic to pegcetacoplan or any of the ingredients in EMPAVELI. See the end of this Medication Guide for a complete list of ingredients in EMPAVELI. have not been vaccinated against Streptococcus pneumoniae , Neisseria meningitidis , and Haemophilus influenzae type B, unless your healthcare provider decides that urgent treatment with EMPAVELI is needed. See " What is the most important information I should know about EMPAVELI? " have a serious Streptococcus pneumoniae , Neisseria meningitidis , or Haemophilus influenzae type B infection. Before you take EMPAVELI, tell your healthcare provider about all of your medical conditions, including if you: have an infection or fever. are pregnant or plan to become pregnant. EMPAVELI may harm your unborn baby. Females who are able to become pregnant should have a pregnancy test before starting treatment with EMPAVELI. Females who are able to become pregnant should use an effective method of birth control (contraception) during treatment with EMPAVELI and for 40 days after the last dose. are breastfeeding or plan to breastfeed. It is not known if EMPAVELI passes into your breast milk. You should not breastfeed during treatment with EMPAVELI and for 40 days after the last dose. Tell your healthcare provider about all the medicines you take , including prescription and over-the-counter medicines, vitamins, and herbal supplements. EMPAVELI and other medicines can affect each other, causing side effects. Know the medicines you take and the vaccines you receive. Keep a list of them to show your healthcare provider and pharmacist when you get a new medicine. How should I take EMPAVELI? See the detailed Instructions for Use that comes with your EMPAVELI for information about how to prepare and infuse your dose of EMPAVELI with your infusion pump. See the detailed Instructions for Use that comes with your EMPAVELI Injector for information about how to prepare and inject your dose of EMPAVELI with your EMPAVELI Injector. Your healthcare provider should show you how to prepare and administer EMPAVELI before you use it for the first time. Use EMPAVELI exactly as your healthcare provider tells you. Do not use more or less than your healthcare provider tells you to. EMPAVELI is given under the skin (subcutaneously) 2 times each week. If there is an increase in your LDH, an enzyme in your blood, your healthcare provider may tell you to take EMPAVELI every 3 days. If you are changing treatment from eculizumab to EMPAVELI, you should continue eculizumab for 4 weeks after your first dose of EMPAVELI. After 4 weeks, you should stop treatment with eculizumab. If you are changing treatment from ravulizumab to EMPAVELI, you should take your starting dose of EMPAVELI no more than 4 weeks after your last dose of ravulizumab. If you have PNH and you stop taking EMPAVELI, your healthcare provider will need to monitor you closely for at least 8 weeks after stopping EMPAVELI. Stopping treatment with EMPAVELI may cause a breakdown of red blood cells due to PNH. Symptoms or problems that can happen due to red blood cell breakdown include: decreased hemoglobin level in your blood blood in your urine shortness of breath trouble swallowing tiredness pain in the stomach (abdomen) blood clots erectile dysfunction (ED) If you miss a dose of EMPAVELI, take the missed dose as soon as possible. Take your next dose at your regularly scheduled time. What are the possible side effects of EMPAVELI? EMPAVELI can cause serious side effects including: See " What is the most important information I should know about EMPAVELI? " Allergic reactions. Allergic reactions can happen during your EMPAVELI infusion. Stop your EMPAVELI infusion and tell your healthcare provider or get emergency medical care right away if you get any of these symptoms during your EMPAVELI infusion: chest pain trouble breathing or shortness of breath swelling of your face, tongue, or throat feel faint or pass out The most common side effects in people with PNH treated with EMPAVELI include: injection-site reactions infections diarrhea pain in the stomach (abdomen) respiratory tract infection pain in the arms, hands, legs or feet low potassium in blood tiredness viral infection cough joint pain dizziness headache rash Tell your healthcare provider about any side effect that bothers you or that does not go away. These are not all of the possible side effects of EMPAVELI. For more information, ask your healthcare provider or pharmacist. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. How should I store EMPAVELI? Store vials of EMPAVELI in the refrigerator between 36°F to 46°F (2°C to 8°C) in the original carton to protect from light. Do not use EMPAVELI past the expiration date stamped on the carton. Keep EMPAVELI and all medicines out of the reach of children. General information about the safe and effective use of EMPAVELI. Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use EMPAVELI for a condition for which it was not prescribed. Do not give EMPAVELI to other people, even if they have the same symptoms that you have. It may harm them. You can ask your pharmacist or healthcare provider for information about EMPAVELI that is written for health professionals. What are the ingredients in EMPAVELI? Active ingredient: pegcetacoplan Inactive ingredients: sorbitol, glacial acetic acid, sodium acetate trihydrate, Water for Injection USP. EMPAVELI may also contain sodium hydroxide and/or additional glacial acetic acid for pH adjustment. Manufactured for: Apellis Pharmaceuticals, Inc. 100 Fifth Avenue Waltham, MA 02451 For patent information: www.apellis.com/productpatent Copyright © 2021 Apellis Pharmaceuticals, Inc. All rights reserved. EMPAVELI is a registered trademark of Apellis Pharmaceuticals, Inc. For more information, go to www.EMPAVELI.com or call 1-866-692-7527 EMP-MG-29Sep2023-4.0

14 CLINICAL STUDIES 14.1 Paroxysmal Nocturnal Hemoglobinuria The efficacy and safety of EMPAVELI in patients with PNH were assessed in two open-label, randomized-controlled Phase 3 studies: Study APL2-302 (NCT03500549) and Study APL2-308 (NCT04085601). All patients who completed the studies were eligible to enroll in a separate long-term extension study. In both studies, patients were vaccinated against Streptococcus pneumoniae , Neisseria meningitidis types A, C, W, Y, and B, and Haemophilus influenzae type B (Hib), either within 2 years prior to Day 1 or within 2 weeks after starting treatment with EMPAVELI. Patients vaccinated after initiation of treatment with EMPAVELI received prophylactic treatment with appropriate antibiotics until 2 weeks after vaccination. In addition, prophylactic antibiotic therapy was administered at the discretion of the investigator in accordance with local treatment guidelines for patients with PNH receiving treatment with a complement inhibitor. A dose of 1,080 mg twice weekly was used for patients randomized to the EMPAVELI group of each study. If required, the dose of EMPAVELI could be adjusted to 1,080 mg every 3 days. EMPAVELI was administered as a subcutaneous infusion; the infusion time was approximately 20 to 40 minutes. Study in Complement-Inhibitor Experienced Adult Patients with PNH (Study APL2-302) The study enrolled patients with PNH who had been treated with a stable dose of eculizumab for at least the previous 3 months and with Hb levels less than 10.5 g/dL. Eligible patients entered a 4-week run-in period during which they received EMPAVELI 1,080 mg subcutaneously twice weekly in addition to their current dose of eculizumab. Patients were then randomized in a 1:1 ratio to receive either 1,080 mg of EMPAVELI twice weekly or their current dose of eculizumab through the duration of the 16-week randomized controlled period (RCP). Randomization was stratified based on the number of packed red blood cell (PRBC) transfusions within the 12 months prior to Day -28 (<4; ≥4) and platelet count at screening (<100,000/mm 3 ; ≥100,000/mm 3 ). Following completion of the RCP, all patients entered a 32-week open-label period (OLP) and received monotherapy with EMPAVELI. Patients initially randomized to eculizumab entered a second 4-week run-in period during which they received EMPAVELI in addition to eculizumab before continuing on to receive EMPAVELI monotherapy. All patients who completed the 48-week period were eligible to enroll in a separate long-term extension study. A total of 80 patients were randomized to receive treatment, 41 to EMPAVELI and 39 to eculizumab. Demographics and baseline disease characteristics were generally well balanced between treatment groups (see Table 2 ). The median times from PNH diagnosis to Day -28 were 6.0 and 9.7 years, respectively, for EMPAVELI and eculizumab. The baseline mean total PNH RBC clone sizes (Type III) were 47% for EMPAVELI and 50% for eculizumab. Twenty-nine percent and 23% of patients had a history of major adverse vascular events, and 37% and 26% had a history of thrombosis for patients receiving EMPAVELI or eculizumab, respectively. Within 28 days prior to the first dose of EMPAVELI or eculizumab, respectively, 34% and 31% of patients used anti-thrombotic agents (anti-platelet and/or anticoagulants). During Study APL2-302, 37% and 36% of patients on EMPAVELI and eculizumab, respectively, used antithrombotic agents. A total of 38 patients in the group treated with EMPAVELI and 39 patients in the eculizumab group completed the 16-week RCP and continued into the 32-week OLP. Because of adverse reactions of hemolysis, 3 patients were discontinued from the EMPAVELI group during the RCP. Two out of 41 patients in the EMPAVELI group needed the dose adjustment to 1,080 mg every 3 days. Table 3: Patient Baseline Demographics and Characteristics in Study APL2-302 Parameter Statistics EMPAVELI (N=41) Eculizumab (N=39) Age (years) Mean (SD) 50.2 (16.3) 47.3 (15.8) Sex Female n (%) 27 (65.9) 22 (56.4) Race Asian n (%) 5 (12.2) 7 (17.9) Black or African American n (%) 2 (4.9) 0 White n (%) 24 (58.5) 25 (64.1) Other n (%) 0 1 (2.6) Not reported n (%) 10 (24.4) 6 (15.4) Ethnicity Hispanic or Latino n (%) 2 (4.9) 1 (2.6) Not Hispanic or Latino n (%) 29 (70.7) 32 (82.1) Not reported n (%) 10 (24.4) 6 (15.4) Hemoglobin level (g/dL) Mean (SD) 8.7 (1.1) 8.7 (0.9) Absolute reticulocyte count (10 9 cells/L) Mean (SD) 218 (75.0) 216 (69.1) LDH level (U/L) Mean (SD) 257.5 (97.7) 308.6 (284.8) Number of transfusions in last 12 months prior to Day -28 Mean (SD) 6.1 (7.3) 6.9 (7.7) <4 n (%) 20 (48.8) 16 (41.0) ≥4 n (%) 21 (51.2) 23 (59.0) The efficacy of EMPAVELI was based on change from baseline to Week 16 (during RCP) in hemoglobin level. Baseline was defined as the average of measurements recorded prior to taking the first dose of EMPAVELI. Supportive efficacy data included transfusion avoidance, defined as the proportion of patients who did not require a transfusion during the RCP, and change from baseline to Week 16 in absolute reticulocyte count (ARC). EMPAVELI was superior to eculizumab for the change from baseline in hemoglobin level at Week 16 ( p <0.0001). The adjusted mean change from baseline in hemoglobin level was 2.37 g/dL in the group treated with EMPAVELI versus -1.47 g/dL in the eculizumab group (Figure 1), demonstrating an adjusted mean increase of 3.84 g/dL with EMPAVELI compared to eculizumab at Week 16 (95% CI, 2.33-5.34). Figure 1: Adjusted Mean (± SE) Change from Baseline to Week 16 in Hemoglobin (g/dL) in Study APL2-302 Treatment effect estimates from a mixed model are shown. The mixed model contained the categorical effects of treatment, visit, treatment by visit interaction, and stratification factors (transfusion history and platelet count at screening), and the continuous covariate of baseline value. Non-inferiority was demonstrated in the endpoints of transfusion avoidance and change from baseline in ARC at Week 16. The adjusted means, treatment differences, and confidence intervals (CIs) for additional efficacy results are shown in Table 4. Table 4: Additional Efficacy Results at Week 16 in Study APL2-302 EMPAVELI (N=41) Eculizumab (N=39) Difference (95% CI) Transfusion avoidance , n (%) 35 (85%) 6 (15%) 63% Difference in percentages and 95% CI were based on the stratified Miettinen–Nurminen method. (48%, 77%) Change from baseline in ARC (10 9 cells/L), LS LS = Least square mean (SE) SE = Standard error -136 (6.5) 28 (11.9) -164 (-189.9, -137.3) Efficacy was generally similar across subgroups based on sex, race, and age. All 77 patients who completed the RCP entered the 32- week OLP, during which all patients received EMPAVELI, resulting in a total exposure of up to 48 weeks. Between Week 16 and Week 48, 10 patients discontinued the study, all due to adverse reactions, and thirteen patients had a dose adjustment to 1,080 mg every three days. The efficacy results at Week 48 were generally consistent with those at Week 16. Study in Complement-Inhibitor Naïve Adult Patients with PNH (Study APL2-308) Study APL2-308 enrolled patients with PNH who had not been treated with any complement inhibitor within 3 months prior to enrollment and with Hb levels less than the lower limit of normal (LLN). Eligible patients were randomized in a 2:1 ratio to receive EMPAVELI or supportive care [excluding complement inhibitors (e.g., transfusions, corticosteroids, supplements such as iron, folate, and vitamin B 12 ), hereafter referred to as the control arm] through the duration of the 26-week treatment period. Randomization was stratified based on the number of packed red blood cell (PRBC) transfusions within the 12 months prior to Day -28 (<4; ≥4). At any point during the study, a patient assigned to the control arm treatment group who had Hb levels ≥2 g/dL below baseline or presented with a PNH associated thromboembolic event was offered cross-over to EMPAVELI for the remainder of the study. A total of 53 patients were randomized, 35 to EMPAVELI and 18 to the control arm. Demographics and baseline disease characteristics were generally well balanced between treatment groups (see Table 4 ). The mean times from PNH diagnosis to Day 1 were 5.7 and 5.5 years, respectively, for EMPAVELI and the control arm. The baseline mean total PNH RBC clone sizes (Type III) were 31% for EMPAVELI and 28% for the control arm. In the EMPAVELI group, 2.9% of patients had a history of major adverse vascular events. Two patients (5.7%) in the EMPAVELI group and 3 patients (16.7%) in the control arm group had a history of at least 1 type of thrombosis. Within 28 days prior to the first dose of EMPAVELI or the control arm, respectively, 17.1% and 27.8% of patients used anti-thrombotic agents (anti-platelet and/or anticoagulants). During Study APL2-308, 8.6% and 0% of patients on EMPAVELI and the control arm, respectively, used antithrombotic agents. Eleven of 18 patients randomized to the control transitioned to cross-over therapy with EMPAVELI due to a decreased Hb level ≥2 g/dL below baseline. Three patients treated with EMPAVELI required dose adjustment to 1,080 mg every 3 days. Three patients (5.7%; two patients in the EMPAVELI group and one patient in the control arm group) discontinued the study, none due to an adverse reaction. Table 5: Patient Baseline Demographics and Characteristics in Study APL2-308 Parameter Statistics EMPAVELI (N=35) Control Arm Control Arm = supportive care (excluding complement inhibitors) (N=18) Age (years) Mean (SD) 42.2 (12.7) 49.1 (15.6) Sex Female n (%) 16 (45.7) 8 (44.4) Race American Indian or Alaska n (%) 9 (25.7) 2 (11.1) Native Asian n (%) 23 (65.7) 16 (88.9) Black or African American n (%) 2 (5.7) 0 Other n (%) 1 (2.9) 0 Ethnicity Hispanic or Latino n (%) 12 (34.3) 2 (11.1) Not Hispanic or Latino n (%) 23 (65.7) 16 (88.9) Hemoglobin level (g/dL) Mean (SD) 9.4 (1.4) 8.7 (0.8) Absolute reticulocyte count (10 9 cells/L) Mean (SD) 230.2 (81.0) 180.3 (109.1) LDH level (U/L) Mean (SD) 2151.0 (909.4) 1945.9 (1003.7) Number of transfusions in last 12 months prior to Day -28 Mean (SD) 3.9 (4.4) 5.1 (5.0) <4 n (%) 21 (60.0) 8 (44.4) ≥4 n (%) 14 (40.0) 10 (55.6) The efficacy of EMPAVELI was based on the percentage of patients achieving hemoglobin stabilization, defined as avoidance of a >1 g/dL decrease in hemoglobin levels from baseline in the absence of transfusion, and the change from baseline in LDH level. Supportive efficacy data included change from baseline in absolute reticulocyte count (ARC), change from baseline in hemoglobin, and transfusion avoidance, defined as the proportion of patients who did not require a transfusion through Week 26. Baseline was defined as the average of measurements recorded prior to taking the first dose of EMPAVELI or prior to randomization to the control arm treatment group. Efficacy results are shown in Table 6 below. Table 6: Efficacy Results During the 26-Week Study in Study APL2-308 EMPAVELI (N=35) Control Arm Control Arm = supportive care (excluding complement inhibitors) Difference (95% CI) (N=18) p-value Data collected after cross-over from the control arm is excluded in analyses. Hemoglobin Stabilization Patients who crossed over from the control arm group to the EMPAVELI group, withdrew from the study, or were lost to follow up are considered as failing to achieve the criteria. (n, %) 30 (85.7%) 0 (0%) 73% (57%, 89%) p<0.0001 p-value is obtained by stratified Cochran-Mantel-Haenszel test. Change from Baseline in LDH The post baseline missing values (including the values after cross-over from the control arm) are imputed using a multiple imputation method. (LS LS = Least square Mean CFB, SE SE = Standard error ) -1870 (101.0) -400 (313.0) -1470 (-2113.4, -827.3) p<0.0001 Change from baseline in ARC (LS Mean CFB, SE ) -123 (9.2) -19 (25.2) -103 (-158.9, -48.7) p = 0.0002 Change from baseline in Hb (LS Mean CFB, SE ) 2.9 (0.38) 0.3 (0.76) 2.7 (0.99, 4.35) p = 0.0019 Transfusion Avoidance (n, %) 32 (91%) 1 (6%) 72% (56%, 89%) p<0.0001 Figure 1

8.5 Geriatric Use Clinical studies of EMPAVELI did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between geriatric and younger patients.

8.4 Pediatric Use Safety and effectiveness in pediatric patients have not been established.

8.1 Pregnancy Risk Summary There are insufficient data on EMPAVELI use in pregnant women to inform a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. There are risks to the mother and fetus associated with untreated PNH in pregnancy (see Clinical Considerations ) . The use of EMPAVELI may be considered following an assessment of the risks and benefits. Treatment of pregnant cynomolgus monkeys with pegcetacoplan at a subcutaneous dose of 28 mg/kg/day (2.9 times human exposure based on AUC) from the gestation period through parturition resulted in a statistically significant increase in abortions or stillbirths compared to controls (see Data ) . The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of major birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriages in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Clinical Considerations Disease-associated maternal and/or fetal/neonatal risk PNH in pregnancy is associated with adverse maternal outcomes, including worsening cytopenias, thrombotic events, infections, bleeding, miscarriages and increased maternal mortality, and adverse fetal outcomes, including fetal death and premature delivery. Data Animal Data Animal reproduction studies with pegcetacoplan were conducted in cynomolgus monkeys. Pegcetacoplan treatment of pregnant cynomolgus monkeys at a subcutaneous dose of 28 mg/kg/day (2.9 times human exposure based on AUC) from the gestation period through parturition resulted in a statistically significant increase in abortions and stillbirths compared to controls. No increase in abortions or stillbirths occurred at a dose of 7 mg/kg/day (1.3 times human exposure based on AUC). No maternal toxicity or teratogenic effects were observed in offspring delivered at term. No developmental effects were observed in infants up to 6 months postpartum. Systemic exposure to pegcetacoplan of less than 1% of maternal levels was detected in fetuses from monkeys treated with 28 mg/kg/day from the period of organogenesis through the second trimester.

8 USE IN SPECIFIC POPULATIONS 8.1 Pregnancy Risk Summary There are insufficient data on EMPAVELI use in pregnant women to inform a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. There are risks to the mother and fetus associated with untreated PNH in pregnancy (see Clinical Considerations ) . The use of EMPAVELI may be considered following an assessment of the risks and benefits. Treatment of pregnant cynomolgus monkeys with pegcetacoplan at a subcutaneous dose of 28 mg/kg/day (2.9 times human exposure based on AUC) from the gestation period through parturition resulted in a statistically significant increase in abortions or stillbirths compared to controls (see Data ) . The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of major birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriages in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively. Clinical Considerations Disease-associated maternal and/or fetal/neonatal risk PNH in pregnancy is associated with adverse maternal outcomes, including worsening cytopenias, thrombotic events, infections, bleeding, miscarriages and increased maternal mortality, and adverse fetal outcomes, including fetal death and premature delivery. Data Animal Data Animal reproduction studies with pegcetacoplan were conducted in cynomolgus monkeys. Pegcetacoplan treatment of pregnant cynomolgus monkeys at a subcutaneous dose of 28 mg/kg/day (2.9 times human exposure based on AUC) from the gestation period through parturition resulted in a statistically significant increase in abortions and stillbirths compared to controls. No increase in abortions or stillbirths occurred at a dose of 7 mg/kg/day (1.3 times human exposure based on AUC). No maternal toxicity or teratogenic effects were observed in offspring delivered at term. No developmental effects were observed in infants up to 6 months postpartum. Systemic exposure to pegcetacoplan of less than 1% of maternal levels was detected in fetuses from monkeys treated with 28 mg/kg/day from the period of organogenesis through the second trimester. 8.2 Lactation Risk Summary It is not known whether pegcetacoplan is secreted in human milk or whether there is potential for absorption and harm to the infant. There are no data on the effects of pegcetacoplan on milk production. Pegcetacoplan is present in milk of lactating monkeys (see Animal Data ) . Since many medicinal products are secreted into human milk, and because of the potential for serious adverse reaction in a breastfeeding child, breastfeeding should be discontinued during treatment and for 40 days after the last dose. Data Animal Data Pegcetacoplan was detectable in milk of lactating monkeys at less than 1% concentration of serum levels but was not detectable in the serum of nursing infants. 8.3 Females and Males of Reproductive Potential Contraception Females EMPAVELI may cause embryo-fetal harm when administered to pregnant women [see Use in Specific Populations (8.1) ] . Pregnancy testing is recommended for females of reproductive potential prior to treatment with EMPAVELI. Advise female patients of reproductive potential to use effective contraception during treatment with EMPAVELI and for 40 days after the last dose. 8.4 Pediatric Use Safety and effectiveness in pediatric patients have not been established. 8.5 Geriatric Use Clinical studies of EMPAVELI did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between geriatric and younger patients.

16 HOW SUPPLIED/STORAGE AND HANDLING How Supplied EMPAVELI injection is a clear, colorless to slightly yellowish aqueous solution for subcutaneous infusion supplied as 1,080 mg/20 mL (54 mg/mL) solution in 20-mL single-dose vials. EMPAVELI is available in 20-mL single-dose vials individually packaged in cartons that are supplied in 8-count convenience cartons. NDC 73606-010-01. Storage and Handling Store vials of EMPAVELI refrigerated at 2°C to 8°C (36°F to 46°F) in the original carton to protect from light. Do not use beyond the expiration date stamped on the carton.

Storage and Handling Store vials of EMPAVELI refrigerated at 2°C to 8°C (36°F to 46°F) in the original carton to protect from light. Do not use beyond the expiration date stamped on the carton.

WARNING: SERIOUS INFECTIONS CAUSED BY ENCAPSULATED BACTERIA Meningococcal infections may occur in patients treated with EMPAVELI and may become rapidly life-threatening or fatal if not recognized and treated early. Use of EMPAVELI may predispose individuals to serious infections, especially those caused by encapsulated bacteria, such as Streptococcus pneumoniae , Neisseria meningitidis types A, C, W, Y, and B, and Haemophilus influenzae type B [see Warnings and Precautions (5.1) ] . Comply with the most current Advisory Committee on Immunization Practices (ACIP) recommendations for vaccinations against encapsulated bacteria in patients with altered immunocompetence associated with complement deficiencies. Vaccinate patients against encapsulated bacteria as recommended at least 2 weeks prior to administering the first dose of EMPAVELI unless the risks of delaying therapy with EMPAVELI outweigh the risk of developing a serious infection. See Warnings and Precautions (5.1) for additional guidance on the management of the risk of serious infections. Vaccination reduces, but does not eliminate, the risk of serious infections. Monitor patients for early signs of serious infections and evaluate immediately if infection is suspected. EMPAVELI is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS). Under the EMPAVELI REMS, prescribers must enroll in the program [see Warnings and Precautions (5.2) ] . Enrollment in the EMPAVELI REMS program and additional information are available by telephone: 1-888-343-7073 or at www.empavelirems.com. WARNING: SERIOUS INFECTIONS CAUSED BY ENCAPSULATED BACTERIA See full prescribing information for complete boxed warning. Meningococcal infections may occur in patients treated with EMPAVELI and may become rapidly life-threatening or fatal if not recognized and treated early. Use of EMPAVELI may predispose individuals to serious infections, especially those caused by encapsulated bacteria, such as Streptococcus pneumoniae , Neisseria meningitidis types A, C, W, Y, and B, and Haemophilus influenzae type B. ( 5.1 ) Comply with the most current Advisory Committee on Immunization Practices (ACIP) recommendations for vaccinations against encapsulated bacteria. ( 5.1 ) Vaccinate patients against encapsulated bacteria as recommended at least 2 weeks prior to administering the first dose of EMPAVELI unless the risks of delaying EMPAVELI therapy outweigh the risks of developing a serious infection. See Warnings and Precautions (5.1) for additional guidance on managing the risk of serious infections. Vaccination reduces, but does not eliminate, the risk of serious infections. Monitor patients for early signs of serious infections and evaluate immediately if infection is suspected. ( 5.1 ) EMPAVELI is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS). Under the EMPAVELI REMS, prescribers must enroll in the program. ( 5.2 )