For a straightforward vaginal yeast infection, Diflucan (fluconazole) is a single 150 mg dose, and most people don’t need a second one. If your infection is severe or keeps coming back, the timing between doses changes: 72 hours apart for short-term treatment, or once a week for long-term maintenance. How often you can safely take it depends entirely on what type of infection you’re treating.
Single Dose for Uncomplicated Yeast Infections
The standard treatment for a typical vaginal yeast infection is one 150 mg pill, taken once. That’s it. Diflucan has an unusually long half-life for an antifungal, roughly 30 hours on average (with a range of 20 to 50 hours). That means the drug stays active in your body for days after you swallow it. Most people notice symptoms improving within 24 hours, with full relief over the next few days.
Because the medication lingers, a single dose is enough to clear a mild to moderate infection. If your symptoms haven’t improved after about three days, that’s worth a conversation with your provider rather than simply taking another pill on your own.
Severe Infections: Two Doses, 72 Hours Apart
When a yeast infection causes significant swelling, redness, or cracking, it falls into the “severe” category. The CDC treatment guidelines recommend two sequential 150 mg doses, with the second taken 72 hours (three days) after the first. So if you take your first dose on a Monday morning, the second would be Thursday morning.
That 72-hour gap isn’t arbitrary. It lines up with how the drug is cleared from your system: by the time you take the second dose, blood levels from the first are dropping but haven’t disappeared, so the second dose extends the antifungal effect without stacking to unnecessarily high levels.
Recurrent Infections: Weekly for Up to 6 Months
Recurrent yeast infections, defined as four or more episodes in a year, require a different approach. Treatment happens in two phases.
First, you take a dose every third day for three total doses (on days 1, 4, and 7). This initial burst is designed to fully clear the active infection. After that, you move to a maintenance phase: one dose per week for six months. The goal of maintenance isn’t to treat an active infection but to suppress yeast overgrowth long enough for the pattern to break.
Six months of weekly dosing sounds like a lot, and it is. Your provider will likely want to monitor your liver function periodically during this time, since the drug is processed by the liver. Many people successfully stop after the six-month course without the infections returning, though some do experience recurrence once they stop.
Why You Shouldn’t Just Keep Retaking It
Diflucan is available over the counter in some countries and easy to get prescribed in others, which makes it tempting to self-treat every time symptoms appear. There are a few reasons to be cautious about that.
First, not every yeast-like symptom is actually a yeast infection. Bacterial vaginosis and other conditions can mimic the itching and discharge, and fluconazole won’t help with those. Taking it repeatedly without a confirmed diagnosis delays proper treatment.
Second, fluconazole is a potent enzyme inhibitor in your liver, and that effect persists four to five days after your last dose. This means it can amplify the effects of many other medications during that window. Certain drugs are outright dangerous to combine with it because of the risk of heart rhythm problems. These include some antibiotics, antipsychotics, and heart medications. If you’re on other prescriptions, the frequency with which you take Diflucan matters more than you might expect.
Third, repeated use without a clear plan can contribute to antifungal resistance, making the drug less effective when you truly need it.
Dosing for Other Fungal Infections
Vaginal yeast infections are the most common reason people search for Diflucan dosing, but the drug is also prescribed for oral thrush, esophageal candidiasis, and serious systemic fungal infections. For these conditions, the dosing schedule is completely different: typically a daily dose (ranging from 50 mg to 400 mg depending on the infection) taken for one to several weeks. In life-threatening infections like cryptococcal meningitis, daily doses can go as high as 800 mg.
These higher-dose, longer-duration regimens are managed closely by a healthcare team and aren’t comparable to the occasional 150 mg pill for a yeast infection.
Pregnancy and Diflucan
Even a single 150 mg dose of fluconazole during pregnancy has been linked in epidemiologic studies to an increased risk of miscarriage and birth defects. Because of this, it’s generally not used during pregnancy at all. Women on the long-term weekly maintenance regimen who become pregnant or plan to become pregnant need to stop treatment. The drug’s long half-life also means it takes roughly a week after the last dose to fully clear from the body, which is relevant for anyone considering conception.