PaxMedica, Inc., a clinical stage biopharmaceutical company, focuses on the development of anti-purinergic drug therapies for the treatment of disorders with intractable neurologic symptoms. Its lead product candidate is PAX-101 that is in Phase 3 clinical trials, an intravenous formulation of suramin for the treatment of autism spectrum disorder, myalgic encephalomyelitis/chronic fatigue syndrome, long COVID-19 syndrome, fragile X syndrome, human African trypanosomiasis (HAT), and fragile X-associated tremor/ataxia syndrome. The company is developing PAX-102, an intranasal formulation of suramin for neurologic indications, as well as other new chemical entities that are targeted and selective antagonists of purine receptor subtypes; and PAX-HAT-301 for the treatment of HAT. It has a research collaboration agreement with PolarMar Health for Phase II clinical trial in austism spectrum disorder for emodin, which retains the rights for PolarMar to develop and commercialize any non-prescription supplement form of the product, and for PaxMedica, Inc.