Ringworm (Tinea) Treatment: OTC Creams, Prescription Options, and When to Escalate

Evidence-Based Management of Dermatophyte Infections

Ringworm (tinea corporis, cruris, pedis, capitis) is a superficial fungal infection. Treatment depends on site, extent, and host factors.

Apply to lesion + 2 cm margin, once or twice daily for 2–4 weeks (continue 1 week after clinical clearance).

Agent	Brand Examples	Class	Notes
Terbinafine 1%	Lamisil AT	Allylamine	Fungicidal; shorter course (1–2 weeks); gold standard for tinea corporis/cruris/pedis
Clotrimazole 1%	Lotrimin AF, Mycelex	Azole	Fungistatic; 2–4 weeks; safe in pregnancy
Miconazole 2%	Desenex, Micatin	Azole	Similar to clotrimazole
Tolnaftate 1%	Tinactin	Thiocarbamate	Fungistatic; good for tinea pedis; less effective for tinea capitis
Butenafine 1%	Lotrimin Ultra	Benzylamine	Fungicidal; once daily; OTC in some countries

Stronger concentrations (econazole 1%, ketoconazole 2%, ciclopirox 0.77%, naftifine 1–2%, luliconazole 1%).
Used if OTC fails after 2–4 weeks; or for extensive/inflammatory lesions.

Indications: Tinea capitis, onychomycosis, extensive body involvement, immunocompromise, topical failure.

Drug	Dose/Duration	Monitoring
Terbinafine	250 mg daily × 2–4 weeks (body), 6–12 weeks (nails)	LFTs baseline + 4–6 weeks if >6 weeks
Griseofulvin	500–1000 mg daily × 4–8 weeks (capitis)	LFTs, CBC; take with fatty meal
Itraconazole	200 mg daily × 1 week (pulse) or continuous	LFTs, drug interactions (CYP3A4)
Fluconazole	150–300 mg weekly × 2–4 weeks	Renal adjustment; fewer interactions

Tinea Capitis: Selenium sulfide 2.5% or ketoconazole 2% shampoo 2–3x/week to reduce shedding/spread.
Kerion (inflammatory boggy plaque): Oral antifungal + short-course prednisone (controversial).
Onychomycosis: Oral therapy essential; topical monotherapy cure rate <20%.
Environmental: Wash bedding/towels hot; treat pets if zoonotic (Microsporum canis).