NSTK · 01.2026Independent supplement reference
NutriStack
Edition 1.0Updated July 13, 2026

Timolol Ophthalmic

Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026

Timolol is a non-selective beta-adrenergic receptor antagonist used topically to reduce intraocular pressure (IOP) in open-angle glaucoma and ocular hypertension. For decades it was the gold-standard first-line glaucoma treatment before prostaglandin analogs became available. It reduces IOP by 20-25% and is still widely used as monotherapy or adjunctive therapy. It carries systemic beta-blocker risks due to ocular absorption.

Evidence tier
Strong
Indexed sources
10 2017–2024
Interactions
0
Category
Prescription
Read the sources → Compare profiles
Publication status

Exploratory record, not a reviewed medical publication.

See the editorial and medical-review policies for the publication gate.

This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.

In short

What the research says.

A quick, data-only summary. The full evidence, dosing, and sources are below.

Timolol is a non-selective beta-adrenergic receptor antagonist used topically to reduce intraocular pressure (IOP) in open-angle glaucoma and ocular hypertension. NutriStack rates the supporting evidence as strong. Common adult dosing is One drop of 0.25% or 0.5% solution in affected eye(s) twice daily; gel-forming solution (Timoptic-XE) once daily in the morning (as prescribed by your physician), though a prescriber sets the actual dose. This profile indexes 10 sources.

What it's good for
  • Well-established IOP reduction (20-25% from baseline)
  • Does not affect pupil size or accommodation
  • Available as gel-forming solution for once-daily dosing5
  • Commonly used in fixed-combination products with other glaucoma agents4,5
What to watch for
  • Ocular stinging and burning
  • Blurred vision
  • Bradycardia (systemic absorption)
  • Asthma or severe COPD (risk of potentially fatal bronchospasm)
  • Sinus bradycardia, second- or third-degree AV block, heart failure (NYHA class IV)

The bottom line

Evidence rating strong. Most-documented uses: well-established iop reduction (20-25% from baseline), does not affect pupil size or accommodation, available as gel-forming solution for once-daily dosing. 10 sources indexed (2017–2024), with 0 interaction records on file.

The science

How it works, mechanistically.

Core mechanism

Non-selectively blocks beta-1 and beta-2 adrenergic receptors in the ciliary epithelium of the eye. This reduces cyclic AMP production, which decreases aqueous humor production by the ciliary body by approximately 20-50%. Unlike prostaglandin analogs, timolol works by reducing aqueous humor production rather than increasing outflow. It does not affect pupil size or accommodation.6

Class
Beta-Blocker / Ophthalmologic
Dosing

Dosing & protocol.

Common range
One drop of 0.25% or 0.5% solution in affected eye(s) twice daily; gel-forming solution (Timoptic-XE) once daily in the morning (as prescribed by your physician)
Recommended form
Ophthalmic solution (0.25%, 0.5%); gel-forming solution (Timoptic-XE) for once-daily dosing

Topical ophthalmic application; significant systemic absorption can occur via nasolacrimal drainage, use nasolacrimal occlusion to minimize. Systemic beta-blockade can occur, particularly in patients using other beta-blocker medications. Do not abruptly discontinue.

Safety

Full safety detail.

Side effects

  • Ocular stinging and burning
  • Blurred vision
  • Bradycardia (systemic absorption)
  • Bronchospasm (systemic absorption, dangerous in asthma/COPD)
  • Hypotension
  • Fatigue and depression
  • Decreased exercise tolerance
  • Masking of hypoglycemic symptoms in diabetic patients

Contraindications

  • Asthma or severe COPD (risk of potentially fatal bronchospasm)
  • Sinus bradycardia, second- or third-degree AV block, heart failure (NYHA class IV)
  • Cardiogenic shock
  • Known hypersensitivity to timolol or other beta-blockers1,2
  • History of severe allergic reactions (beta-blockers may increase severity and reduce response to epinephrine)
Sources

Sources, by evidence tier.

Numbered references. Citations throughout the page link here.

Reviews & position papers

5

Reference material

5
FAQ

Common questions.

Quick answers about Timolol Ophthalmic, drawn from the data on this page.

What is Timolol Ophthalmic?

Timolol is a non-selective beta-adrenergic receptor antagonist used topically to reduce intraocular pressure (IOP) in open-angle glaucoma and ocular hypertension. For decades it was the gold-standard first-line glaucoma treatment before prostaglandin analogs became available. It reduces IOP by 20-25% and is still widely used as monotherapy or adjunctive therapy. It carries systemic beta-blocker risks due to ocular absorption.

What is Timolol Ophthalmic used for?

Commonly cited benefits of Timolol Ophthalmic include: Well-established IOP reduction (20-25% from baseline); Does not affect pupil size or accommodation; Available as gel-forming solution for once-daily dosing; Commonly used in fixed-combination products with other glaucoma agents. NutriStack rates the overall evidence as strong.

What is a typical dose of Timolol Ophthalmic?

A typical adult dose of Timolol Ophthalmic is One drop of 0.25% or 0.5% solution in affected eye(s) twice daily; gel-forming solution (Timoptic-XE) once daily in the morning (as prescribed by your physician). The commonly recommended form is Ophthalmic solution (0.25%, 0.5%); gel-forming solution (Timoptic-XE) for once-daily dosing. These are general ranges, not personalized advice; confirm the right dose with a clinician.

What are the side effects of Timolol Ophthalmic?

Reported side effects include ocular stinging and burning, blurred vision, bradycardia (systemic absorption), bronchospasm (systemic absorption, dangerous in asthma/copd), hypotension, fatigue and depression. This is educational information; check with a healthcare professional before use.

How strong is the evidence for Timolol Ophthalmic?

NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.

Use this with your stack

Timolol Ophthalmic in NutriStack.

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NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.