Diagnosis Recessive myotonia congenita (Becker's disease). Management Explanation of the nature of the disease and treatment with mexiletine 200 mg twice daily. A 56-year-old woman with a history ...

"The typical inability to relax after a muscle contraction in myotonia congenita is not seen during or between attacks of adynamia episodica hereditaria." It was therefore with some interest that ...