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“3 Propranolol intensified the paralytic effect of tubocurarine in the rat diaphragm and prevented antagonism of tubocurarine paralysis by tetraethylammonium.”
British journal of pharmacology • 1976 | View Paper
“The neuromuscular block induced in cats by depolarizing drugs was intensified and the effect of tubocurarine was reduced by intravenous infusions of propranolol , although by themselves they did not affect contraction of skeletal muscle.”