Drug Interactions between brimonidine / dorzolamide / timolol ophthalmic and ivabradine

MONITOR: Topically administered alpha-2 adrenergic receptor agonists such as apraclonidine and brimonidine are systemically absorbed, with the potential for producing rare but clinically significant systemic effects such as hypotension and bradycardia. The possibility for an additive or potentiating effect on blood pressure and heart rate should be considered when used with other medications that affect these parameters, such as ophthalmic and systemic beta blockers, vasodilators, cardiac glycosides, and antihypertensive agents.

MANAGEMENT: Blood pressure and pulse rate should be monitored regularly when topical alpha-2 adrenergic receptor agonists are prescribed in combination with cardiovascular drugs. Patients should be advised to notify their physician if they experience slow pulse, irregular heartbeat, dizziness, lightheadedness, or syncope.

MONITOR: Coadministration of ivabradine with other drugs that can slow the heart rate such as beta-blockers, calcium channel blockers, and digitalis may increase the risk of excessive bradycardia or other conduction disturbances. Non-cardiac drugs that may also cause bradycardia include atazanavir, fingolimod, lacosamide, lithium, mefloquine, succinylcholine, thalidomide, H2-receptor antagonists, tricyclic antidepressants, and anticholinesterase or cholinergic agents.

MANAGEMENT: Caution is advised when ivabradine is prescribed with other bradycardic drugs. Heart rate should be closely monitored, and the dosage of ivabradine adjusted accordingly. Patients should be advised to report significant decreases in heart rate or symptoms such as dizziness, lightheadedness, fatigue, and hypotension.