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“Treatment with procainamide and quinidine , but not with disopyramide, protected α-adrenoceptors from persistent blockade by phenoxybenzamine ; quinidine was far more effective than procainamide.”
Journal of cardiovascular pharmacology • 1981 | View Paper
“The effect of quinidine (4 mg/liter) on the ERP of the rat heart was potentiated in the presence of phenoxybenzamine (50 µg/liter) or phentolamine (100 µg/liter).”