Blockade of slow calcium channels in skeletal muscle by opioid drugs.
D000818:Animals; D001001:Anura; D066298:In Vitro Techniques; D007473:Ion Channels / Q000187:drug effects*; D009132:Muscles / Q000187:drug effects*; D009294:Narcotics / Q000494:pharmacology*
D007473:Ion Channels; D009294:Narcotics