Positive results from clinical pharmacokinetic bridging study of Tonmya (cyclobenzaprine-low dose) to support development and partnering in Japan and China

Results indicate that key pharmacokinetic parameters of cyclobenzaprine are comparable in ethnic Japanese and Chinese volunteers to Caucasian volunteers from a prior PK study. Tonmya was generally well tolerated in the ethnic Japanese and Chinese healthy volunteers. The company expects these data to fulfill the requirement for a bridging study, and to support regulatory filings for clinical studies in Japan and China where cyclobenzaprine is a new chemical entity (NCE). Tonix holds issued patents for market exclusivity rights of Tonmya in Japan, China, Hong Kong and Taiwan.

This study characterized the PK profile and dose proportionality of Tonmya following administration in 20 healthy volunteers of documented Japanese or Chinese ancestry, and compared these findings to an existing PK dataset conducted under similar conditions in Caucasian volunteers.

“This bridging study is an important first step as we begin evaluating the potential for approval and marketing Tonmya in Japan and China. The results show a similar pharmacokinetic profile in ethnic Japanese and Chinese volunteers with a Caucasian comparator group,” said Seth Lederman, M.D., Chief Executive Officer of Tonix Pharmaceuticals. “As a result, we believe that these data, with supporting results recently reported from the positive Phase III RESILIENT study, are the only clinical data needed to support regulatory filings in Japan and China.”

Dr. Lederman continued, “With patents issued in Japan, China, Hong Kong and Taiwan expected to provide market exclusivity into 2034, we believe that Tonmya would be a welcome addition to the therapeutic options for fibromyalgia patients in East Asia and an attractive asset for the right development and commercialization partners in these markets. Cyclobenzaprine is an NCE in both of these countries. We plan to meet with Japan’s Pharmaceuticals and Medical Devices Agency (PMDA) and China’s National Medical Products Administration (NMPA) to seek agreement on the development of Tonmya in Japan and China, respectively.”

About the Asia Bridging Study : The study was a randomized, single-dose, open-label, 2-way, crossover study design in ethnic Japanese (N=10) and Chinese (N=10) healthy male and female volunteers. The primary objective of the study was to characterize the PK profile and dose proportionality of Tonmya following administration of 2.8 mg and 5.6 mg (one and two 2.8 mg tablets) under fasting conditions in Japanese and Chinese volunteers, and to retrospectively compare these PK data with existing PK data of both cyclobenzaprine and norcyclobenzaprine from a prior Phase 1 study in Caucasian volunteers dosed under the same conditions. Safety and tolerability were also assessed. A 2.8 mg or 5.6 mg dose (2 X 2.8 mg tablet) of Tonmya was administered sublingually in the morning under fasted conditions. Blood samples were collected pre-dose and up to 15 days post-dose for analyte measurements, with a 28-day washout between periods. The primary PK endpoints were the total amount of cyclobenzaprine and metabolite norcyclobenzaprine in the blood (expressed as the area under the curve (AUC0-T)) and maximum concentration (expressed as Cmax).

Study Results : Pharmacokinetics: Ethnic Japanese and Chinese volunteers were considered comparable on PK parameters for cyclobenzaprine following a 2.8 mg and 5.6 mg dose of Tonmya, and dose proportionality was demonstrated in both samples. Given that the similarity in PK profile between Japanese and Chinese volunteers was confirmed, the PK data from the two ethnic groups were pooled for the comparison between Asian (n=20) and Caucasian (n=16) volunteers. The PK parameters of cyclobenzaprine for Japanese, Chinese, and Caucasian groups were similar, with geometric mean ratios falling within the 90% confidence interval.

Safety Tonmya was shown to be safe and well-tolerated at doses up to 5.6 mg as single sublingual administrations in healthy adult Japanese and Chinese volunteers. The incidence of adverse events (AEs) and investigational product-related AEs was low. No volunteer discontinued due to an AE. No clinically significant abnormal findings in laboratory parameters, ECGs, or other safety assessments were noted during the study. No severe AEs and no deaths were reported during the study.