NutriStack
Alcohol and Timolol Ophthalmic, a caution.
Timolol eye drops can be systemically absorbed and produce beta-blocker effects such as slower heart rate, lower blood pressure, dizziness, or syncope. Alcohol can worsen orthostatic blood pressure control and psychomotor impairment. The combination is most important in older adults, people with low resting heart rate, conduction disease, falls, or other blood-pressure medicines.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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At a glance
- Substances
- Alcohol and Timolol Ophthalmic
- Pair type
- Caution
- Evidence (highest tier)
- Moderate
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Moderate evidence
Caution
What is happening. Timolol eye drops can be systemically absorbed and produce beta-blocker effects such as slower heart rate, lower blood pressure, dizziness, or syncope. Alcohol can worsen orthostatic blood pressure control and psychomotor impairment. The combination is most important in older adults, people with low resting heart rate, conduction disease, falls, or other blood-pressure medicines.
Mechanism. Ophthalmic timolol can enter systemic circulation through conjunctival and nasolacrimal absorption, causing beta-adrenergic blockade. Alcohol impairs vasoconstrictor responses during standing and can add CNS impairment, increasing the chance of symptomatic hypotension or falls.
Recommendation. Limit alcohol when starting timolol eye drops and avoid drinking if you have dizziness, fainting, or a very low pulse. Use punctal occlusion after each dose to reduce systemic absorption. Seek care for fainting, chest pain, wheezing, severe shortness of breath, or persistent heart rate below your clinician's threshold.
Sources (2)
- Nieminen T, Lehtimaki T, Maenpaa J, et al. Ophthalmic timolol: plasma concentration and systemic cardiopulmonary effects. Scand J Clin Lab Invest. 2007;67(2):237-245. PMID 17366003
- Narkiewicz K, Cooley RL, Somers VK. Alcohol potentiates orthostatic hypotension: implications for alcohol-related syncope. Circulation. 2000;101(4):398-402. PMID 10653831
Stack Score
How this pair moves the number.
Effect on the composite score
If both Alcohol and Timolol Ophthalmic are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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