Non-selective beta-blocker that reduces aqueous humor production by the ciliary body, lowering intraocular pressure
At a glance
Class
Beta-adrenergic blocker (ophthalmic)
Storage
Store below 25°C, protect from light; discard 28 days after opening
Dosing
Glaucoma (adjunct to primary therapy)
Duration: Long-term as adjunct; 1 drop per affected eye
Glaucoma (adjunct)
Duration: Long-term; 1 drop per affected eye
Educational reference only
This information is provided for educational purposes and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian before administering any medication to your pet.
Find a vet near you →Safety
Absolute contraindications — do not use
Bradycardia or heart block
Systemic beta-blockade from ophthalmic absorption
Brachycephalic breeds
Higher respiratory sensitivity
Adverse effects
Common
Mild ocular stinging
Slight decrease in heart rate
Serious
Bradycardia
Bronchospasm (systemic absorption)
Intraocular pressureHeart rateRespiratory rate
Educational reference only
This information is provided for educational purposes and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian before administering any medication to your pet.
Find a vet near you →Interactions
No documented interactions.
FAQs
Frequently asked questions
›What is Timolol?
Timolol is a beta-adrenergic blocker (ophthalmic) used in pets. Non-selective beta-blocker that reduces aqueous humor production by the ciliary body, lowering intraocular pressure
›What is Timolol used for in pets?
Timolol is used in veterinary medicine for: Glaucoma (adjunct to primary therapy); Glaucoma (adjunct).
›What is the Timolol dose for dogs?
For dogs, Timolol is typically dosed as follows — Glaucoma (adjunct to primary therapy): 0 mg/kg Ophthalmic BID. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›What is the Timolol dose for cats?
For cats, Timolol is typically dosed as follows — Glaucoma (adjunct): 0 mg/kg Ophthalmic BID. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›What are the side effects of Timolol?
Common: Mild ocular stinging, Slight decrease in heart rate. Serious (call your vet immediately): Bradycardia, Bronchospasm (systemic absorption).
›Does Timolol need a prescription?
Yes. Timolol is a prescription medication and should only be administered under veterinary supervision.
›When should Timolol not be used?
Do not use Timolol if: Asthma / Bronchospasm.
Educational reference only
This information is provided for educational purposes and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian before administering any medication to your pet.
Find a vet near you →References
References
The PetCare.AI drug reference is built from 13 authoritative sources cited across 580 drug monographs.
Textbooks & handbooks — 5
- Plumb's Veterinary Drug Handbook
- Withrow & MacEwen's Small Animal Clinical Oncology
- Merck Veterinary Manual
- NRC Nutrient Requirements of Dogs and Cats
- Veterinary Pharmacology and Therapeutics (Riviere & Papich)
Clinical guidelines & consensus — 4
- ASPCA Animal Poison Control Center Guidelines
- AAHA Diabetes Management Guidelines
- ASPCA Poison Control Guidelines
- RECOVER CPR Guidelines
Journals & peer-reviewed studies — 2
- EPIC Study (J Vet Intern Med 2016)
- JVIM FAT CAT Study
Regulatory & approvals — 1
- CDSCO Veterinary Drug Approval Registry (1969–2026)
Databases — 1
- Washington State University VCPL MDR1 Database