Dantrolene (E4902-GRP)

Dantrolene is an antagonist of ryanodine receptor (RYR) and a postsynaptic skeletal muscle relaxant that reduces calcium release from the sarcoplasmic reticulum (SR), leading to a dose-dependent decrease in myoplasmic free calcium levels. It is used to treat and control the accelerated hypermetabolism of skeletal muscle that leads to a malignant hyperthermia crisis.