NutriStack
Coenzyme Q10 and Timolol Ophthalmic, a synergy.
Timolol eye drops can produce systemic beta-blockade through nasolacrimal absorption, especially in older adults. Like systemic beta-blockers, timolol inhibits mitochondrial CoQ10-dependent enzymes; CoQ10 supplementation may help, though the systemic exposure with ophthalmic dosing is lower than with oral therapy.
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At a glance
- Substances
- Coenzyme Q10 and Timolol Ophthalmic
- Pair type
- Synergy
- Evidence (highest tier)
- Emerging
- Source citations
- 2 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Emerging evidence
Synergy
What is happening. Timolol eye drops can produce systemic beta-blockade through nasolacrimal absorption, especially in older adults. Like systemic beta-blockers, timolol inhibits mitochondrial CoQ10-dependent enzymes; CoQ10 supplementation may help, though the systemic exposure with ophthalmic dosing is lower than with oral therapy.
Mechanism. Topical timolol is absorbed through the nasolacrimal duct and conjunctiva, achieving plasma levels capable of systemic beta blockade. Like other beta-blockers, it can inhibit CoQ10-dependent mitochondrial enzymes; CoQ10 supplementation restores activity.
Recommendation. If you use timolol eye drops and experience fatigue or systemic beta-blocker symptoms (bradycardia, exercise intolerance), consider CoQ10 100-200 mg/day. Punctal occlusion when administering drops also reduces systemic absorption.
Sources (2)
- Kishi T, Watanabe T, Folkers K. Bioenergetics in clinical medicine XV. Inhibition of coenzyme Q10-enzymes by clinically used adrenergic blockers of beta-receptors. Res Commun Chem Pathol Pharmacol. 1977;17(1):157-64. PMID 17892
- Munroe WP, Rindone JP, Kershner RM. Systemic side effects associated with the ophthalmic administration of timolol. Drug Intell Clin Pharm. 1985;19(2):85-9. PMID 3882377
Stack Score
How this pair moves the number.
Effect on the composite score
If both Coenzyme Q10 and Timolol Ophthalmic are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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