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The effects were studied of several calcium channel blocking agents on muscle twitch, and possible interactions between these drugs and pancuronium and suxamethonium, using a rat phrenic-hemidiaphragm preparation. Nicardipine, verapamil and diltiazem each caused a concentration-related depression of muscle response. Nicardipine had the most, and diltiazem the least, potent effect. Verapamil and diltiazem 5 and 10 mumol litre-1 caused a concentration-dependent enhancement of suxamethonium-induced neuromuscular blockade, but increased the effect of pancuronium only at 10 mumol litre-1. Nicardipine 10 mumol litre-1 significantly enhanced pancuronium-induced neuromuscular blockade, but not that produced by suxamethonium.
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