Fluconazole (Diflucan) is an antifungal medication used to treat yeast infections, oral thrush, and some serious fungal infections. After surgery, it is commonly prescribed for vaginal yeast infections that follow antibiotic use, for thrush in patients who used inhaled steroids or had reduced oral hygiene, and for systemic infections in immunocompromised patients. Understanding how to take it correctly avoids the most common pitfalls.
What Fluconazole Treats
Vaginal yeast infections (candidiasis): Often a single 150 mg oral dose. A second dose 3 days later is sometimes added for severe or recurrent infections.
Oral thrush: 100 to 200 mg daily for 7 to 14 days, depending on severity.
Esophageal candidiasis: 200 to 400 mg daily for 14 to 21 days.
Systemic candidiasis or candidemia: Higher daily doses for several weeks, prescribed by an infectious disease specialist.
Fungal urinary tract infections: 200 to 400 mg daily for 7 to 14 days.
How to Take It
Take with or without food. Consistency matters more than meal timing.
Drink water with each dose to reduce stomach upset.
Complete the full course even if you feel better. Stopping early increases the chance of relapse.
If a dose is missed and it is within 12 hours of the scheduled time, take it. If closer to the next dose, skip and resume your normal schedule.
Symptoms typically improve within 1 to 3 days for vaginal yeast and 3 to 5 days for thrush. Tell your prescriber if no improvement by then.
Side Effects and Cautions
Common: headache, nausea, stomach pain, diarrhea, rash. Most are mild and resolve.
Liver enzyme elevations are usually mild and reversible. Tell your prescriber if you notice yellowing of the skin or eyes, dark urine, or unusual fatigue.
QT prolongation (a heart rhythm change) can occur, particularly at higher doses or when combined with other QT-prolonging drugs.
Severe skin reactions are rare. Stop the medication and seek care for any blistering rash or rash with mouth sores.
Pregnancy: Single low-dose use is generally considered low risk. Higher doses or longer treatment in early pregnancy have been associated with risk and require obstetric input.
Important Drug Interactions
Warfarin: Fluconazole increases warfarin effect. Closer INR monitoring and dose reduction are often needed.
Statins (simvastatin, atorvastatin, lovastatin): Fluconazole raises statin levels and the risk of muscle problems.
Many antiarrhythmics (amiodarone), some antidepressants (citalopram), and methadone can have additive QT effects with fluconazole. Tell your prescriber all medications.
Yes, this is a common combination because antibiotics often trigger yeast overgrowth. There is no major interaction between most antibiotics and fluconazole. Tell your pharmacist all medications so they can review for interactions.
How fast will my yeast infection improve?
Vaginal yeast infections typically improve significantly within 24 to 48 hours of a single 150 mg dose. Thrush usually improves over 3 to 5 days. If you do not see improvement in that window, contact your prescriber. The infection may need a longer course or a different antifungal.
Can I drink alcohol on fluconazole?
Light to moderate alcohol is not specifically prohibited, but heavy drinking adds liver stress and is not recommended. The medication itself does not produce a disulfiram-like reaction with alcohol the way metronidazole does.
For patients
Get a personalized care plan.
This guide provides general information. For instructions tailored to your specific procedure, ask your provider about QR Rx care plans.
These medication guides are for educational purposes only and do not replace medical advice. Always follow your healthcare provider's specific medication instructions.
