Long Term Safety Study of Amifampridine Phosphate in MuSK-MG (Muscle Specific Tyrosine Kinase Myasthenia Gravis)
Long Term Safety Study of Amifampridine Phosphate in MuSK-MG (Muscle Specific Tyrosine Kinase Myasthenia Gravis)
Evaluate the long-term safety of amifampridine phosphate in the symptomatic relief of
 antibody positive MuSK-MG.
Inclusion Criteria:

 -  Participated in the MSK-002 study

 Exclusion Criteria:

 -  Epilepsy and currently on medication

 -  Clinically significant abnormalities in ECG, in the opinion of the Investigator