Clotrimazole: veterinary dose and monograph

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

• 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

• 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

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

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
• Caspofungin
• Enilconazole
• Fluconazole
• Griseofulvin
• Itraconazole
• Ketoconazole
• Lime Sulfur (Lime Sulphur Dip)

Frequently asked questions