Triple-action combination: gentamicin provides bactericidal activity against gram-negative and some gram-positive organisms; betamethasone reduces inflammation and pruritus; clotrimazole provides antifungal activity against Malassezia and dermatophytes
At a glance
Class
Otic combination (antibiotic + corticosteroid + antifungal)
Storage
Below 25°C, shake well before use
Dosing
Otitis externa (bacterial, fungal, or mixed)
Max dose
12 drops per ear/dose; 24 drops per ear/day
Duration: 7–14 days; reassess if not improving by 7 days
Otitis externa
Max dose
4 drops per ear/dose; 8 drops per ear/day
Duration: 7–14 days
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
Ruptured tympanic membrane
Gentamicin is ototoxic if it reaches the middle/inner ear
Known hypersensitivity to any component
Adverse effects
Common
Transient increased ear discharge
Local irritation
Serious
Ototoxicity (if tympanic membrane ruptured)
Deafness
Systemic corticosteroid effects with prolonged use
Tympanic membrane integrity (otoscopy before use)Clinical improvementCytology follow-upSigns of hearing loss
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.
Brands
International
Otomax
Merck Animal Health
Mometamax
Merck Animal Health
Surolan (similar combination)
Elanco
FAQs
Frequently asked questions
›What is Otomax (Gentamicin+Betamethasone+Clotrimazole Otic)?
Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) is a otic combination (antibiotic + corticosteroid + antifungal) used in pets. Triple-action combination: gentamicin provides bactericidal activity against gram-negative and some gram-positive organisms; betamethasone reduces inflammation and pruritus; clotrimazole provides antifungal activity against Malassezia and dermatophytes
›What is Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) used for in pets?
Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) is used in veterinary medicine for: Otitis externa (bacterial, fungal, or mixed); Otitis externa.
›What is the Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) dose for dogs?
For dogs, Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) is typically dosed as follows — Otitis externa (bacterial, fungal, or mixed): 4–12 drops per ear otic BID. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›What is the Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) dose for cats?
For cats, Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) is typically dosed as follows — Otitis externa: 2–4 drops per ear otic BID. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›What are the side effects of Otomax (Gentamicin+Betamethasone+Clotrimazole Otic)?
Common: Transient increased ear discharge, Local irritation. Serious (call your vet immediately): Ototoxicity (if tympanic membrane ruptured), Deafness, Systemic corticosteroid effects with prolonged use.
›Does Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) need a prescription?
Yes. Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) is a prescription medication and should only be administered under veterinary supervision.
›When should Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) not be used?
Do not use Otomax (Gentamicin+Betamethasone+Clotrimazole Otic) if: Ruptured tympanic membrane; Known hypersensitivity to any component.
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