Timolol Hemihydrate has 7 known drug interactions based on U.S. FDA drug labeling data. 3 are classified as major interactions requiring close medical supervision. Notable interactions include combinations with Calcium Antagonists, Quinidine, Reserpine. Patients taking Timolol Hemihydrate should inform their healthcare provider of all current medications — including over-the-counter drugs and supplements — to avoid potentially harmful combinations. Data sourced from OpenFDA and the NIH National Library of Medicine.
- Total
- 7
- Major
- 3
- Moderate
- 4
Major (3)
- Timolol Hemihydrate + Calcium Antagonists— May cause atrioventricular conduction disturbances, left ventricular failure, and hypotension. Should be avoided in pati…
- Timolol Hemihydrate + Quinidine— CYP2D6 inhibitor that potentiates systemic beta-blockade, resulting in decreased heart rate.
- Timolol Hemihydrate + Reserpine— Catecholamine-depleting drug with potential additive effects producing hypotension and/or marked bradycardia, which may …
Moderate (4)
- Timolol Hemihydrate + Clonidine— Oral beta-blockers may exacerbate rebound hypertension following clonidine withdrawal, though no reports with ophthalmic…
- Timolol Hemihydrate + Digitalis Glycosides— May have additive effects in prolonging atrioventricular conduction time when used concomitantly with timolol.
- Timolol Hemihydrate + Nonselective Beta-Adrenergic Antagonists— Concomitant use may potentiate systemic beta-blockade with additive effects on heart rate and intraocular pressure.
- Timolol Hemihydrate + Timolol— (7.4) Potentiated systemic beta-blockade (e.g., decreased heart rate) has been reported during combined treatment with q…