Reports of enhanced mydriatic action w/ adrenaline & dipivefrin HCl. Risk of excessive sympathetic nervous system suppression, hypotension & bradycardia w/ catecholamine-depleting drugs (eg, reserpine). Risk of enhanced reduction in IOP or β-blocker systemic effect w/ systemically administered β-blockers (eg, atenolol, propranolol HCl, metoprolol tartrate). Risk of AV block, left ventricular failure & hypotension w/ Ca antagonists (eg, verapamil HCl, diltiazem HCl). Enhanced inhibition of cardiac conduction w/ digitalis prep (eg, digoxin, digitoxin). Reports of enhanced β-blocking activity (eg, decreased heart rate, bradycardia) w/ CYP2D6 inhibitors (eg, quinidine sulfate hydrate, SSRIs). Reports of elevated IOP w/ ophth prostaglandin analogues (eg, isopropyl unoprostone, bimatoprost).