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Amifampridine (3,4-Diaminopyridine) is primarily used to treat rare muscle diseases. It blocks potassium channel efflux in nerve terminals, increasing action potential duration, which allows Ca2+ channels to remain open longer and enhances acetylcholine release to stimulate muscles at the end plate.

Amifampridine is mainly used to treat many rare muscle diseases. In the United States, aminopyridine is being studied for the treatment of Lambert-Eaton myasmus syndrome (LEMS). Amifampridine is also used to treat many congenital myasthenia syndromes, par