What Is Diflucan? Uses, Dosage, and What You Need to Know in 2026

Diflucan is the brand name for fluconazole, one of the most widely prescribed antifungal medications in the world. Whether you've been prescribed a single pill for a yeast infection or you're taking it long-term to prevent fungal infections, this guide explains what Diflucan is, what it treats, how to take it, and everything else you need to know.

What Is Diflucan (Fluconazole)?

Diflucan is the brand name for fluconazole, a prescription antifungal medication in the triazole class. It was originally developed by Pfizer and received FDA approval in 1990. Today, it is available as an inexpensive generic from many manufacturers. Diflucan (fluconazole) is a member of the triazole family and stands as one of the most commonly used antifungal agents worldwide, offering therapeutic utility across a wide spectrum of fungal infections.

Fluconazole works by blocking a key enzyme that fungi need to build their cell membranes. Without this enzyme functioning correctly, fungal cells cannot grow and maintain their structure, which kills or stops the growth of the infection.

What Is Diflucan Used For?

Diflucan has several FDA-approved indications and is also used off-label for a number of conditions:

Vaginal candidiasis (vaginal yeast infections): The most common use. A single 150 mg oral dose treats uncomplicated vaginal yeast infections. FDA-approved.

Oropharyngeal candidiasis (oral thrush): White patches in the mouth from Candida overgrowth. Treated with 200 mg loading dose, then 100 mg/day for 2 weeks. FDA-approved.

Esophageal candidiasis: Candida infection of the esophagus — common in immunocompromised patients including those with HIV. 200 mg loading dose, then 100–200 mg/day for at least 3 weeks. FDA-approved.

Candidemia and disseminated candidiasis: Candida infections in the bloodstream or other organs. Doses of 400–800 mg/day for extended periods. FDA-approved.

Cryptococcal meningitis: A serious fungal infection of the brain lining, particularly in AIDS patients. Fluconazole is used for consolidation and suppression after initial amphotericin B treatment. FDA-approved.

Prophylaxis in bone marrow transplant: 400 mg/day to prevent candidiasis in patients undergoing chemotherapy or radiation for transplant. FDA-approved.

Recurrent vulvovaginal candidiasis (RVVC) — off-label: 150 mg weekly for 6 months as maintenance/suppressive therapy. Well-established practice.

Diflucan Dosage Forms and Strengths

Fluconazole is available in the following forms:

Oral tablets: 50 mg, 100 mg, 150 mg, and 200 mg

Oral suspension: 10 mg/mL and 40 mg/mL (useful for children and patients who can't swallow tablets)

IV injection: 200 mg/100 mL — administered in hospital settings for serious infections

How to Take Diflucan

Diflucan can be taken with or without food — food does not significantly affect how the drug is absorbed. This is one of fluconazole's practical advantages over some other antifungals (like itraconazole capsules, which require food and acid for proper absorption).

For a single-dose prescription (150 mg for vaginal yeast infection): Take the one tablet as directed. Symptoms typically begin to improve within 24 hours and fully resolve within 3–7 days for most patients.

For multi-day regimens: Take exactly as prescribed. Do not stop early even if you feel better — completing the course helps prevent resistance and recurrence.

Is Diflucan a Controlled Substance?

No. Fluconazole is not scheduled by the DEA and is not a controlled substance. Any licensed prescriber — including nurse practitioners and physician assistants — can write a prescription for it without special registration. It can be called in, sent electronically, or faxed to a pharmacy.

Key Drug Interactions to Know

Fluconazole inhibits several liver enzymes (CYP2C19, CYP2C9, CYP3A4) and has significant interactions with warfarin, pimozide, quinidine, erythromycin, clopidogrel, and immunosuppressants. Always review your full medication list with your doctor before starting fluconazole. Read our detailed guide: Diflucan Drug Interactions.

How Much Does Diflucan Cost?

Generic fluconazole is among the most affordable prescription medications available. A single 150 mg tablet can be purchased for as little as $2.79 with a GoodRx coupon. Longer courses (30-tablet, 200 mg) range from $20–$60 at retail, substantially less with coupons. Brand-name Diflucan costs significantly more; always ask for the generic.

Where to Find Diflucan If Your Pharmacy Is Out

Generic fluconazole is widely available, but pharmacies occasionally run low on specific strengths. If your pharmacy doesn't have it, use medfinder.com — we call pharmacies near you to find which ones have your prescription ready to fill. Results are texted directly to you.