Fluconazole 150mg — brand name Diflucan — is the modern first-line treatment for uncomplicated vaginal yeast infection. A single oral dose, taken once, effectively treats most cases. It's more convenient than the multi-day OTC topical regimens (Monistat 1, 3, or 7), equally effective per evidence, and the standard of care per CDC and ACOG guidelines.

How fluconazole works

Fluconazole is a triazole antifungal. It inhibits an enzyme called lanosterol 14α-demethylase that fungi need to make ergosterol, an essential component of their cell membrane. Without ergosterol, the Candida cell membrane becomes leaky and the fungus dies. Per FDA prescribing information, fluconazole has excellent oral bioavailability (>90%) and reaches therapeutic concentrations in vaginal tissue within 24 hours.

Dosing for uncomplicated yeast infection

Standard dose: 150mg orally, single dose. Take with or without food. Most patients notice symptom improvement within 24–48 hours, with full resolution by day 5–7. Per the CDC STI Treatment Guidelines, a single dose is sufficient for uncomplicated vulvovaginal candidiasis in non-pregnant adults.

Side effects

Fluconazole is generally well tolerated as a single dose. The most common side effects are mild and short-lived: nausea, headache, abdominal pain, and occasional diarrhea. Rare but more serious effects include allergic reaction (rash, hives), liver enzyme elevation (usually asymptomatic), and very rare hepatotoxicity — the latter much more relevant to long-term high-dose therapy than a single dose.

Drug interactions to know

Fluconazole inhibits several cytochrome P450 enzymes (CYP3A4, CYP2C9, CYP2C19). Even a single dose can affect: warfarin (increased INR/bleeding risk), some statins (atorvastatin, simvastatin — increased muscle toxicity risk), certain seizure medications (phenytoin), tacrolimus and other immunosuppressants. Tell your prescribing physician about all medications you're taking. Most healthy adults on no other prescriptions can safely take single-dose fluconazole.

Pregnancy and fluconazole

Oral fluconazole is generally avoided in the first trimester due to possible association with birth defects. Topical azole antifungals (clotrimazole, miconazole) are the preferred treatment for yeast infections in pregnancy. If you're pregnant, mention it during your visit — the doctor will adjust accordingly.

Fluconazole vs. topical azoles (Monistat)

Both work for uncomplicated yeast infection. A Cochrane systematic review of randomized trials found roughly equivalent cure rates between oral fluconazole and topical clotrimazole/miconazole. The practical differences: oral is one pill once vs topical is 1–7 days of insertion; oral has no local irritation; topical has fewer drug interactions; topical is available without prescription. For most uncomplicated cases in adults who can tolerate oral medications, single-dose fluconazole is the more convenient option — which is why it's the modern first-line choice.

When fluconazole isn't the right choice

Pregnancy (especially first trimester), severe drug interactions, history of fluconazole allergy, severely impaired liver function, non-albicans Candida species (often resistant to fluconazole), and complicated/recurrent cases (which may need longer regimens — see recurring yeast infections). For these situations, topical therapy or specialist follow-up is the right path.

How CodyMD prescribes fluconazole

Text Cody, describe symptoms, mention any medications and pregnancy status. A licensed physician reviews your case against CDC criteria for uncomplicated yeast. If you fit, the prescription is sent electronically to your pharmacy and ready in 1 hour. The visit is $49 flat. For the full visit process, see online yeast infection treatment, and for pricing details yeast treatment pricing.