Topical Antifungal — Otomycosis Pregnancy: Topical use considered safe — negligible systemic absorption; limited data

Clotrimazole Ear Drops

Brand names: Canesten Ear, Clotrimazole 1% Solution

Adult dose

Dose: 2–3 drops

Route: Otic

Frequency: Three times daily for 14–21 days

Max: 3 drops per ear three times daily

First-line treatment for otomycosis (fungal otitis externa). Most common causative organisms: Aspergillus niger (black spores), Aspergillus fumigatus, Candida albicans. Requires thorough aural toilet (microsuction) before application. Continue for minimum 2 weeks after symptom resolution.

Paediatric dose

Dose: 2–3 drops drops/kg

Route: Otic

Frequency: Three times daily

Max: 3 drops per ear three times daily

Same dose as adults; safe in children. Ensure aural toilet performed before use.

Dose adjustments

Renal

No dose adjustment required (topical — negligible systemic absorption)

Hepatic

No dose adjustment required

Paediatric weight-based calculator

Patient weight (kg)

Same dose as adults; safe in children. Ensure aural toilet performed before use.

Clinical pearls

Otomycosis diagnosis: black or white fluffy debris in the ear canal — Aspergillus niger produces characteristic black spore heads visible on otoscopy or microsuction
Aural toilet (microsuction by ENT) is essential before and during treatment — antifungal drops cannot penetrate fungal debris
Avoid topical antibacterial/steroid drops (gentamicin, hydrocortisone) — steroids promote fungal growth; if misdiagnosed as bacterial OE and treated with steroid drops, otomycosis worsens dramatically
Prolonged antibiotic or steroid ear drop use is the most common precipitating factor for otomycosis
Treatment failure or recurrence: consider systemic itraconazole or voriconazole in immunocompromised patients; re-examine for perforated TM
Topical acetic acid (2%) is an alternative antifungal agent — changes pH of ear canal to inhibit fungal growth

Contraindications

Perforated tympanic membrane (relative — limited data)
Hypersensitivity to clotrimazole

Side effects

Local burning or stinging (transient)
Local irritation
Skin sensitisation (rare)

Interactions

Negligible at topical otic doses

Monitoring

Symptom response at 2 weeks
Repeat microsuction if debris accumulates
TM integrity

Reference: BNFc; BNF 90; BNFc; ENT-UK Otomycosis Guidelines; NICE CKS Otitis Externa. Verify against your local formulary and the latest BNF before prescribing.

Curated clinical cross-links plus same-class fallbacks.

Pathways