# Clotrimazole: veterinary dose and monograph

> Clotrimazole is a veterinary antifungal. An imidazole antifungal used TOPICALLY for dermatophytosis (ringworm) and MALASSEZIA dermatitis/otitis (commonly as the antifungal in combination ear preparations), and — a key veterinary use — as a 1 % SOLUTION INFUSED into the nasal… Indications include dermatophytosis (ringworm) — topical; malassezia dermatitis / otitis externa (combination ear products); canine sino-nasal aspergillosis — 1 % clotrimazole sinus/nasal infusion (standard topical therapy). This monograph lists 3 reference doses for dogs and cats, each with route, frequency and source.

Source: https://vetmasterji.com/drugs/clotrimazole · Last reviewed: 2026-10-01

## At a glance

- **Drug class:** Antifungal
- **Also known as:** Canesten, Candid, Lotrimin, Otibiotic (component)
- **Species with doses:** Dogs and Cats
- **Routes:** Topical
- **Last reviewed:** 1 October 2026

## Indications

- Dermatophytosis (ringworm) — topical
- Malassezia dermatitis / otitis externa (combination ear products)
- Canine sino-nasal aspergillosis — 1 % clotrimazole sinus/nasal infusion (standard topical therapy)
- Localised cutaneous yeast/fungal infections

## Clotrimazole dose by species

Doses are per administration unless stated. mg/kg doses scale with body weight; per-animal, per-quarter and infusion-rate doses are shown as the reference writes them.

### Dogs

*Clotrimazole doses for dogs*

| Indication | Dose | Route | Frequency | Duration |
| --- | --- | --- | --- | --- |
| Sino-nasal aspergillosis (1 % sinus infusion) | 1% solution soak of the nasal cavity/sinuses under GA for about 1 h (specialist protocol) | Topical | single ~1 h soak (repeat if needed) | — |
| Dermatophytosis / Malassezia (topical) | Spray q12h; cream/ointment up to four times daily; otic products per label | Topical | q6–12h | — |

- Sino-nasal aspergillosis (1 % sinus infusion): Under GA, the nasal cavity/frontal sinuses are packed and soaked with 1 % clotrimazole solution (~1 h, repositioning); a standard, effective topical treatment — confirm the cribriform plate is intact (CT) first. Not dosed in Papich 5e; Plumb’s 10e p.1434 mentions infusion of 1% clotrimazole into the frontal sinuses (small retrospective reviews found no neurologic effects even with cribriform-plate lysis) but prints no protocol — specialist procedure; follow a current referral protocol.
- Dermatophytosis / Malassezia (topical): Plumb’s 10e p.1434 (Clotrimazole, Topical): sprays usually twice daily; ointments to affected areas up to four times daily; veterinary products per label. Avoid eyes and mucous membranes; wear gloves.

### Cats

*Clotrimazole doses for cats*

| Indication | Dose | Route | Frequency | Duration |
| --- | --- | --- | --- | --- |
| Dermatophytosis / Malassezia (topical) | Spray q12h; cream/ointment up to four times daily; otic products per label | Topical | q6–12h | — |

- Dermatophytosis / Malassezia (topical): Plumb’s topical monograph. Topical adjunct only — generalised ringworm needs systemic therapy and environmental control. Prevent grooming.

## Contraindications

Known imidazole hypersensitivity. Cribriform plate defect / extension of nasal aspergillosis into the brain — caution with sinus infusion (the solution could reach the CNS). Ophthalmic use only with appropriate preparations. Otherwise minimal (topical).

## Species-specific warnings

> **Caution:** Dogs: Before a clotrimazole sinus infusion for aspergillosis, image (CT) to confirm the cribriform plate is intact — otherwise the solution can reach the CNS.

## Adverse effects

- Local irritation / contact reaction
- Sinus infusion: transient nasal discharge, sneezing, swelling; rare CNS exposure if cribriform plate is breached
- Essentially no systemic toxicity (topical)

## Drug interactions

- No significant systemic drug interactions (topical use)
- Combination ear/skin products: paired with antibiotics/steroids

## Pregnancy and lactation

Topical use is low-risk (negligible absorption).

## Monitoring

- Dermatophyte cultures / Malassezia cytology and clinical response
- Sino-nasal aspergillosis: endoscopic/CT follow-up; repeat infusion if needed
- Local tolerance; cribriform plate integrity (CT) before sinus infusion

## Toxicity and overdose

Very safe topically — local irritation is the main effect. The specific procedural caution is sinus infusion in a dog whose nasal aspergillosis has eroded the cribriform plate, where the solution could reach the brain — imaging (CT) should confirm an intact plate first.

Management: Rinse/discontinue for local irritation; supportive. For sinus infusion in a compromised cribriform plate, manage any CNS exposure supportively. No specific antidote needed.

## Clinical pearls

- A standard, effective topical SINUS-INFUSION therapy for canine sino-nasal aspergillosis (1 % solution under GA) — but CONFIRM the cribriform plate is intact (CT) first, or the solution could reach the brain
- A reliable topical for ringworm and the antifungal in many Malassezia ear products
- Surface-acting and very safe — but generalised dermatophytosis still needs systemic therapy + environmental decontamination
- For otitis, pair the antifungal with addressing the underlying cause and any bacterial component

## Mechanism of action

An imidazole that inhibits fungal cytochrome-P450 14-α-demethylase, blocking ergosterol synthesis; at the high concentrations achieved topically it also directly damages fungal membrane integrity. The result is fungistatic/fungicidal activity against dermatophytes, Malassezia/Candida and Aspergillus at the application site. Systemic absorption from topical/sinus use is minimal.

## Formulations and products

- Topical cream / lotion / powder 1 %
- 1 % solution for nasal/sinus infusion (aspergillosis)
- Otic preparation (often with antibiotic + steroid)
- Otic combinations (clotrimazole + antibiotic + steroid) (Various) — 1 % clotrimazole otic, Ear drops (combination)
- Candid / Canesten — 1 % cream / lotion / powder / solution, Topical (human-label)

## Storage

Creams/solutions/otic: 15–30 °C, protect from light/freezing.

## Before you use this dose

> **Caution:** Reference doses for veterinary professionals. Confirm the dose against the product label, the patient’s condition, current guidance and local regulations before use; the attending veterinarian remains responsible for every clinical decision.

## Other antifungals

- [Amphotericin B](https://vetmasterji.com/drugs/amphotericin-b)
- [Caspofungin](https://vetmasterji.com/drugs/caspofungin)
- [Enilconazole](https://vetmasterji.com/drugs/enilconazole)
- [Fluconazole](https://vetmasterji.com/drugs/fluconazole)
- [Griseofulvin](https://vetmasterji.com/drugs/griseofulvin)
- [Itraconazole](https://vetmasterji.com/drugs/itraconazole)
- [Ketoconazole](https://vetmasterji.com/drugs/ketoconazole)
- [Lime Sulfur (Lime Sulphur Dip)](https://vetmasterji.com/drugs/lime-sulfur)

## Frequently asked questions

### What is the dose of Clotrimazole for dogs?

Reference doses for Clotrimazole in dogs: 1% solution soak of the nasal cavity/sinuses under GA for about 1 h (specialist protocol) Topical single ~1 h soak (repeat if needed) (Sino-nasal aspergillosis (1 % sinus infusion)); Spray q12h; cream/ointment up to four times daily; otic products per label Topical q6–12h (Dermatophytosis / Malassezia (topical)). Confirm against the label and the patient before use.

### What is the dose of Clotrimazole for cats?

Reference doses for Clotrimazole in cats: Spray q12h; cream/ointment up to four times daily; otic products per label Topical q6–12h (Dermatophytosis / Malassezia (topical)). Confirm against the label and the patient before use.

### When should Clotrimazole not be used?

Known imidazole hypersensitivity. Cribriform plate defect / extension of nasal aspergillosis into the brain — caution with sinus infusion (the solution could reach the CNS). Ophthalmic use only with appropriate preparations. Otherwise minimal (topical).

### What are the side effects of Clotrimazole in animals?

Local irritation / contact reaction; Sinus infusion: transient nasal discharge, sneezing, swelling; rare CNS exposure if cribriform plate is breached; Essentially no systemic toxicity (topical).

## Sources

- Plumb's Veterinary Drug Handbook
- Merck Veterinary Manual, 11th edition
- Papich, Papich Handbook of Veterinary Drugs, 5th edition

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VetMasterJi is a clinical decision-support and education platform for veterinary professionals and students. It does not provide veterinary advice, diagnosis or treatment for specific animals. All drug doses, calculators and differentials are references that must be independently verified before clinical use; the attending registered veterinarian remains solely responsible for every clinical decision.