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“ Quinidine was also recognized to inhibit the secretion and to promote the absorption of substrates of P-glycoprotein, chlorpromazine , and verapamil.”
Journal of pharmaceutical sciences • 1998 | View Paper
“Although chlorpromazine and quinidine have dissimilar chemical properties, both are negative inotropic agents and both depress the ATPase activity of cardiac sarcotubular fractions.”