Pharmacology. Dantrolene relaxes skeletal muscle by inhibiting the release of calcium from the sarcoplasmic reticulum, thereby reducing actin-myosin contractile activity. Dantrolene can help control hyperthermia that results from excessive muscle hyperactivity, particularly when hyperthermia is caused by a defect within the muscle cells (eg, malignant hyperthermia). Dantrolene is not a substitute for other temperature-controlling measures (eg, sponging and fanning).

Indications

1. 
   

   The primary indication for dantrolene is malignant hyperthermia (See Hyperthermia).

   
   
2. 
   

   Dantrolene may be useful in treating hyperthermia and rhabdomyolysis caused by drug-induced muscular hyperactivity that is not controlled by usual cooling measures or neuromuscular paralysis.

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