Drug Interactions between brimonidine / dorzolamide / latanoprost / timolol ophthalmic and Uritact-EC

GENERALLY AVOID: The combination of large doses of salicylates and oral carbonic anhydrase inhibitors (CAI) may rarely result in severe metabolic acidosis and/or salicylate toxicity. The mechanism is unknown but may involve salicylate-induced displacement of CAIs from plasma protein-binding sites and reduced renal clearance, or CAI-induced plasma pH changes resulting in increased amounts of unionised salicylates entering the CNS. Coma and death have been reported. Although this has not been reported with ocular CAIs, the clinician should consider the possibility of an interaction with these agents, also.

MANAGEMENT: In general, concomitant use of antirheumatic doses of salicylates and oral CAIs is not recommended. If coadministration is necessary, careful monitoring of the patient's mental status and acid base balance is strongly recommended. Patients should be advised to promptly notify their physicians if they experience symptoms such as lethargy, tinnitus, confusion, nausea, vomiting, or hyperventilation.

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MONITOR: Topically administered alpha-2 adrenergic receptor agonists such as brimonidine are systemically absorbed, with the potential for producing rare but clinically significant systemic effects. Despite relative alpha-2 selectivity, theoretical concerns exist that coadministration with monoamine oxidase inhibitors (MAOIs) may increase the risk of hypertension due to potentiation of alpha-1 stimulation, which produces vasoconstriction. MAOIs may also theoretically interfere with the metabolism of brimonidine, which may result in increased systemic adverse effects such as drowsiness, dizziness, lightheadedness, hypotension, and bradycardia. However, an interaction with MAOIs has not been reported in the medical literature.

MANAGEMENT: Patients receiving brimonidine in combination with MAOIs should be made aware of the potential for increased adverse effects, and counseled to avoid activities requiring mental alertness until they know how these agents affect them. Patients should also avoid rising abruptly from a sitting or recumbent position and notify their physician if they experience orthostasis or tachycardia. Blood pressure should be monitored closely.

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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.

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