Calcium release from skeletal muscle sarcoplasmic reticulum: site of action of dantrolene sodium.

@article{Winkle1976CalciumRF,
  title={Calcium release from skeletal muscle sarcoplasmic reticulum: site of action of dantrolene sodium.},
  author={W. Barry van Winkle},
  journal={Science},
  year={1976},
  volume={193 4258},
  pages={1130-1}
}
The muscle relaxant dantrolene sodium acts directly and specifically on skeletal muscle, unlike other pharmacological agents which affect the central nervous system or act at the nueromuscular junction. Dantrolene sodium markedly suppresses the release of calcium previously sequestered by skeletal, but not cardiac, muscle sarcoplasmic reticulum. No effect in the total amount of calcium accumulated was found. In situ, the drug may reduce the amount of calcium necessary for muscle contraction. 

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