Myotonic Dystrophy, also known as myotonia atrophica, is related to myotonia and myotonic dystrophy 2, and has symptoms including excessive daytime somnolence and weakness. An important gene associated with Myotonic Dystrophy is DMPK (DM1 Protein Kinase). The drugs Lamotrigine and Dopamine have been mentioned in the context of this disorder. Affiliated tissues include heart and skeletal muscle, and related phenotypes are Decreased viability and Increased cell viability after pRB stimulation