Positive efficacy results led to Praxis Precision Medicines Inc.’s phase II Embold study in developmental and epileptic encephalopathies (DEEs) being halted early, propelling the company’s shares dramatically upward.
In October 2025, BioWorld tracked 252 clinical trial updates across phases I-III, roughly in line with September’s 230 but markedly higher than the 95 logged in August. Of those, 27 phase III studies reported positive results, while four disclosed failures. Clinical trial updates logged by BioWorld in October comprised 91 phase I reports, 75 from phase II, and 87 from phase III studies.
Success by nearly all measures with Praxis Precision Medicines Inc.’s essential tremor phase III candidate, ulixacaltamide, drove the company’s stock up significantly and provided solid data for an NDA filing planned for early 2026.
Praxis Precision Medicines Inc. is making a change to its upcoming registrational, 400-patient Power2 study – adding a dose arm plus a depression/mood endpoint – based on encouraging phase II data from the Radiant study with vormatrigine in focal onset seizure (FOS) patients over an eight-week period. Specifically, Power2 will test 20 mg, 30 mg, and 40 mg of the drug against placebo for 12 weeks.
After Study 1’s independent data monitoring committee said the experiment will likely fall short of its primary endpoint with ulixacaltamide in essential tremor, Praxis Precision Medicines Inc. plans to wait for full data from Study 1 as well as Study 2 in the Essential 3 phase III program before deciding on regulatory moves.
In the wake of Sage Therapeutics Inc.’s recent phase II fizzle with SAGE-324 in essential tremor, Wall Street is waiting for better news in the indication, which has racked up failures across several developers. Among those finding favor lately is Praxis Precision Medicines Inc. with Nav-targeting ulixacaltamide, also known as PRAX-628, which Oppenheimer analyst Francois Brisebois said “warrants particular attention.”
Praxis Precision Medicines Inc. has disclosed inhibitors of potassium channel subfamily T member 1 (KCNT1) and its mutants reported to be useful for the treatment of Brugada syndrome, heart failure, muscle disorders, myocardial infarction, neurological disorders, pain, pruritus and psychiatric disorders.
Despite numerous marketed anti-seizure medications in the U.S., patients with epilepsy continue to experience breakthrough seizures and tolerability issues compounded with drug interactions and side effects, leaving room for companies like Praxis Precision Medicines Inc. to fill treatment gaps. The Boston-based company presented phase IIa proof-of-concept data March 26 showing that in an evaluation of photo paroxysmal response, its once-daily oral small-molecule treatment, PRAX-628, resulted in a complete response in three epilepsy patients receiving 45 mg of the drug and four patients receiving 15 mg for a combined complete response rate of 88%.
Xenon Pharmaceuticals Inc. took to the stage this week at the J.P. Morgan Healthcare Conference to talk up its pipeline, including the phase III program testing XEN-1101 in focal-onset seizures (FOS), due to complete enrollment in the second half of this year. It’s an indication where such other players as Biohaven Ltd. are busy, too. Several million adults are afflicted with FOS in the U.S., with close to a half-million pediatric patients.
Boston-based Praxis Precision Medicines Inc.’s shares rose nearly 25% on Jan. 8 after it announced a pipeline update and licensing deal for its tremor drug, ulixacaltamide (PRAX-944), with Shanghai’s Tenacia Biotechnology Co. Ltd.
