Overview A Phase 3 Study of Amifampridine Phosphate in Patients With Lambert Eaton Myasthenic Syndrome (LEMS) Status: Completed Trial end date: 2016-07-01 Target enrollment: Participant gender: Summary A Phase 3 study to evaluate the efficacy and safety of Amifampridine Phosphate in patients with Lambert-Eaton Myasthenic Syndrome (LEMS). Phase: Phase 3 Details Lead Sponsor: Catalyst Pharmaceuticals, Inc.Treatments: 3,4-diaminopyridineAmifampridine