Vaginal yeast infections can be treated with a prescription pill called fluconazole 150 mg that is taken only once. One Diflucan tablet taken orally treats most uncomplicated infections, under the brand name Diflucan. It begins to act within a day, and symptoms are completely relieved within 3 to 7 days. Fluconazole is prescription-only in the US and can be prescribed by a clinician via telehealth or face-to-face. It works, is really easy to use, it interacts with some medicines and is not recommended for use in pregnancy.

TL;DR: Key takeaways

  • Fluconazole 150 mg (Diflucan) is a single-dose oral pill for vaginal yeast infections.

  • One tablet treats most uncomplicated infections; stubborn cases may need a second dose.

  • It starts working within 24 hours, with full relief usually in 3 to 7 days.

  • Common side effects are mild: headache, nausea, and stomach upset.

  • It interacts with several drugs and is generally avoided in pregnancy. Get medical advice first.

What is fluconazole 150 mg?

Fluconazole 150 mg is an antiviral drug that comes as a tablet and is usually given as a single dose to treat vaginal yeast infections (vaginal candidiasis). The typical dosage is 150 mg.

Most Diflucan prescriptions are filled with the generic version, which is identical to Diflucan 150, the brand name. Fluconazole is in a class of medications called azole antifungals that prevent the growth of fungus. According to the Mayo Clinic, fluconazole is used to treat serious fungal infections, and is also effective in treating common fungal infections, with a single 150 mg dose being the standard treatment for an uncomplicated yeast infection. It is given orally (by mouth) but many people prefer it as a cream or suppository.

How fluconazole works

Knowing how the fluconazole 150 mg tablet works is the reason that only one tablet is needed. It is a cell-killer therapy that works against the fungus that is causing the infection.

Fluconazole works by blocking an enzyme that is required for the growth of a protective outer coating on the fungal cell. If it is not present, the fungal cells can not survive and multiply, and the infection subsides. One tablet works for several days after you take it and is effective enough to cure the infection, the GoodRx drug information says. This allows for the convenient single dose method, which wouldn't be possible with antifungals, which are used every day for a week.

Fluconazole dosage for yeast infection

The standard fluconazole dosage for yeast infection is straightforward, which is part of its appeal. For most people, it is a single pill.

The dose is one fluconazole 150 mg tablet taken by mouth (with or without food) as needed for an uncomplicated vaginal yeast infection. Most infections only require a single dose. If symptoms are more persistent or severe, a second 150 mg dose may be administered 3 days after the first dose. In case of recurrent infections (four or more per year), a multi-dose treatment over weeks is sometimes recommended, the CDC treatment guidelines state. Remember to take it as prescribed by your clinician as the correct dosage is dependent on your condition. Never take more of a medicine than prescribed.

How long does fluconazole take to work?

One of the most frequently asked questions is how long will it take fluconazole to take effect as people want it to take effect quickly. The truth is it begins rather quickly but not immediately.

Once the drug has been administered, fluconazole gets to work on the fungus immediately, beginning to work within 24 hours. But you won't feel better right away. Itching, burning and discharge begin to improve within 1-3 days; complete relief is usually achieved in 3-7 days. If you don't feel any better after a few days or if you don't get better within a week, talk to your clinician and they might need to give you another dose or change your diagnosis. It is normal and expected to take about the first couple of days to be patient.

Fluconazole side effects

Like all medications, fluconazole can cause side effects, though for a single 150 mg dose they are usually mild and uncommon. Knowing them helps you use it safely.

Common fluconazole side effects include:

  • Headache

  • Nausea or upset stomach

  • Stomach pain

  • Diarrhea

  • Dizziness

  • A temporary change in taste

These are typically mild and pass on their own. Rare but serious side effects that need immediate medical attention include signs of an allergic reaction (rash, swelling, trouble breathing), severe skin reactions, or signs of liver problems such as yellowing skin, dark urine, or persistent nausea, the Mayo Clinic warns. Fluconazole can also affect heart rhythm in rare cases, particularly at higher or repeated doses. If you experience anything beyond mild, short-lived effects, contact a healthcare provider.

Drug interactions and who should be cautious

This is the most important safety section, because fluconazole interacts with a notable number of medications. These interactions are a key reason it requires a prescription and medical oversight.

Fluconazole can interact with blood thinners like warfarin, certain statins, some diabetes medications, specific heart-rhythm drugs, and others, sometimes raising the levels or effects of those medications. Tell your clinician and pharmacist about every medication and supplement you take before starting fluconazole. People with liver disease, kidney problems, or heart-rhythm conditions need extra caution, the NHS notes. Importantly, fluconazole is generally not recommended during pregnancy, especially the first trimester, as it has been linked to risks for the developing baby; pregnant people should use other treatments under a clinician's guidance. This is exactly why a prescriber reviews your history first.

How to get fluconazole 150 mg

Because fluconazole is prescription-only in the US, you cannot buy it over the counter, unlike creams such as Monistat. Getting it requires a clinician, but that no longer means a long wait.

For an uncomplicated yeast infection with clear symptoms, you can get a fluconazole prescription quickly, either at an in-person visit or through telehealth. August's online urgent care connects you with a licensed US doctor who can evaluate your symptoms and, when appropriate, send a prescription to your pharmacy, often the same day, for a flat $39. This is a fast, convenient route for a straightforward case. If you are unsure whether your symptoms are actually a yeast infection, since other conditions can mimic one, you can first describe them to August, a free AI health assistant, to help you decide your next step. It is a starting point, not a diagnosis. For a first-ever infection, confirming the diagnosis with a clinician is especially wise.

Frequently Asked Questions

Fluconazole starts working within 24 hours, but you will not feel relief immediately. Most people notice symptoms improving within 1 to 3 days, with full relief usually by 3 to 7 days. The drug stays active in your body for several days, so a single dose keeps working. If symptoms do not improve after a few days, or persist beyond a week, contact your clinician.

For most uncomplicated vaginal yeast infections, yes, a single fluconazole 150 mg tablet is enough. The drug remains active for several days, treating the infection from one dose. For more severe symptoms, a clinician may add a second dose three days later, and recurrent infections may need a longer course. Always follow your clinician's specific instructions rather than taking extra doses yourself.

There is no difference in the medication itself. Diflucan 150 is the original brand name, and fluconazole is the generic version. Both contain the same active ingredient at the same 150 mg dose and work identically. The generic is usually much cheaper. Most prescriptions are filled with generic fluconazole unless the brand is specifically requested, and they are medically equivalent.

For a single 150 mg dose, side effects are usually mild and uncommon, including headache, nausea, stomach upset, diarrhea, and dizziness. These typically pass on their own. Rare but serious effects, like allergic reactions, severe skin reactions, or signs of liver problems such as yellowing skin, need immediate medical care. If you experience anything beyond mild, short-lived symptoms, contact a healthcare provider promptly.

Generally, no. Fluconazole is usually not recommended during pregnancy, particularly the first trimester, because it has been linked to risks for the developing baby, especially at higher doses. Pregnant people with a yeast infection should use other treatments, such as topical antifungals, under a clinician's guidance. If you are pregnant or might be, tell your healthcare provider before taking fluconazole so they can recommend a safe option.

Yes. In the US, fluconazole 150 mg is prescription-only and cannot be bought over the counter. Over-the-counter yeast infection treatments are topical products like Monistat. To get fluconazole, you need a clinician's prescription, which you can obtain at an in-person visit or through telehealth for a straightforward case, often with the prescription sent to your pharmacy the same day.

Fluconazole interacts with several medications, including blood thinners like warfarin, certain statins, some diabetes and heart-rhythm drugs, and others. It can raise the levels or effects of these medicines. Always tell your clinician and pharmacist about every medication and supplement you take before starting fluconazole. People with liver, kidney, or heart-rhythm conditions need extra caution, which is part of why a prescriber reviews your history first.

Yes. While the 150 mg single dose is mainly used for vaginal yeast infections, fluconazole treats other fungal infections too, including oral thrush, esophageal candidiasis, and certain systemic fungal infections, though those uses involve different doses and durations. The dosing and length of treatment depend entirely on the type and severity of infection, which is why a clinician determines the right regimen for each situation.