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Neuromuscular blockades induced by clindamycin alone and with d-tubocurarine or pancuronium were examined in the in-vitro guinea pig lumbrical muscle-nerve preparation. Clindamycin, 80-240 mug/ml, initially increased twitch tension. With higher concentrations (180-240 mug/ml) twitch tension subsequently decreased. With 15 to 20 per cent depression of twitch tension by clindamycin, neostigmine (5-20 ng/ml) or calcium (81 mug/ml) slightly but not completely antagonized the blockade. Clindamycin, 40 mug/ml, a dose that did not depress twitch tension, potentiated d-tubocurarine- or pancuronium-induced neuromuscular bloackade. Plasma concentrations of clindamycin of 10-40 mug/ml were recommended for treating serious infections. The authors conclude that the administration of clindamycin may augment nondepolarizing blockade in man, and antagonism by neostigmine and calcium may be incomplete.
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