Overview Long Term Safety of Amifampridine Phosphate in Spinal Muscular Atrophy 3 Status: Enrolling by invitation Trial end date: 2022-04-01 Target enrollment: Participant gender: Summary A long term safety study of amifampridine phosphate in patients with spinal muscular atrophy (SMA) Type 3. Phase: Phase 2 Details Lead Sponsor: Catalyst Pharmaceuticals, Inc.Treatments: 3,4-diaminopyridine4-AminopyridineAmifampridine