Hyperekplexia, also known as hereditary hyperekplexia, is related to hyperekplexia 1 and hyperekplexia 2, and has symptoms including fever, muscle rigidity and opisthotonus. An important gene associated with Hyperekplexia is GLRA1 (Glycine Receptor Alpha 1), and among its related pathways/superpathways are Transmission across Chemical Synapses and Beta-2 adrenergic-dependent CFTR expression. The drugs Picropodophyllin and Cytarabine have been mentioned in the context of this disorder. Affiliated tissues include brain and globus pallidus, and related phenotypes are spasticity and hyperreflexia