Key takeaways:
How long fluconazole (Diflucan) takes to work depends on what you’re taking it for. For vaginal yeast infections, you may start to feel symptom relief within 24 hours.
Fluconazole can interact with many medications, including warfarin (Coumadin, Jantoven), certain statins, and sulfonylureas.
The most common side effects of fluconazole include headache, nausea, and stomach pain. Rare but serious risks include liver problems, serious skin reactions, and anaphylaxis.
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If you’ve ever had to navigate a fungal infection, your healthcare professional may have prescribed fluconazole (Diflucan). It’s an antifungal medication used to treat a variety of fungal infections. How you take fluconazole and for how long depends on what you’re taking it for.
Regardless of why you’re taking it, you may have questions about how long it’ll take before your infection symptoms improve. You should also know what to do if you miss a dose and how to deal with side effects.
With these tips and more, you can get the most out of your fluconazole prescription.
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Overview: Fluconazole uses
Fluconazole is a prescription-only medication that treats various fungal infections. It can also prevent fungal infections in certain people who have a weakened immune system. This includes some infections caused by Candida, a fungus that’s part of the “yeast” family.
Fluconazole is FDA approved to treat the following types of Candida infections in adults and children at least 6 months old:
Vaginal yeast infections
Thrush in the mouth or esophagus
Peritonitis (inflammation of the membrane lining your stomach)
Blood infections
Liver and spleen infections
Fluconazole is also approved to treat meningitis caused by Cryptococcus (another type of fungus).
Depending on your health history and the type of infection you have, you may be prescribed a specific form of fluconazole. It’s available as a tablet, oral liquid, and injection given into a vein. Your fluconazole dosage will vary depending on what infection you’re taking it for.
Now that you know a little bit more about fluconazole, below are five pharmacist-backed tips on how to take it.
1. How fast fluconazole works depends on the infection you have
If you have a vaginal yeast infection, you may only need 1 dose of fluconazole. After your dose, you may see your symptoms start to improve within 24 hours. If your symptoms don’t improve within 3 days, contact your prescriber. You may need another dose.
For other infections (like oral thrush), it may take several days before you start to feel better. For more serious infections, such as blood or liver infections, it could take at least a week or longer.
2. Consistency is key with daily fluconazole
Fluconazole is usually taken once a day. It doesn’t matter what time of day you take it.
If you’re prescribed a daily dose of fluconazole (rather than just a single, one-time dose), you should take it at the same time each day. This will help you remember to take it. It will also ensure that you have a steady amount of fluconazole in your body at all times to treat your infection.
Even if you start feeling better, continue taking fluconazole until your prescription is finished. If you stop fluconazole too soon, your infection may not fully clear. This can cause your symptoms to come back.
3. What to do if you miss a dose of fluconazole
If you miss a dose of fluconazole, take it as soon as you remember. But if it’s almost time for your next dose, skip the dose you missed. Take your next dose at your regularly scheduled time.
Avoid taking two doses at once to make up for a missed dose. Doubling up on doses can increase your risk of side effects.
If you’re taking fluconazole for multiple days, it’s important to remember to take your medication daily. Missing doses can make it harder for fluconazole to treat your infection, and you may not recover as quickly.
4. Some medications can interact with fluconazole
Drug interactions with fluconazole are possible. They can occur regardless of when you take your other medications throughout the day.
Common medications that interact with fluconazole include:
Warfarin (Coumadin, Jantoven)
Phenytoin (Dilantin, Phenytek)
Citalopram (Celexa)
Amiodarone (Pacerone)
Clopidogrel (Plavix)
Statins, such as atorvastatin (Lipitor) and simvastatin (FloLipid, Zocor)
Sulfonylureas, such as glipizide (Glucotrol XL) and glyburide (DiaBeta, Glynase)
This isn’t a complete list of possible fluconazole interactions. Give your prescriber and pharmacist an updated list of medications you take. It should include any prescription and over-the-counter (OTC) medications, including any supplements and herbal products. They can help you check for potential fluconazole interactions.
Certain health conditions may affect fluconazole too
Some health conditions can affect whether fluconazole is a good option for you.
For example, if you have certain heart rhythm problems or electrolyte imbalances, you may have a higher risk of heart-related side effects. It can also worsen symptoms of liver disease. And fluconazole isn’t recommended during pregnancy.
If you have any of these conditions, your prescriber may monitor you more closely or recommend a different antifungal.
5. There are ways to manage fluconazole side effects
Like most medications, fluconazole has possible side effects to be aware of. Many of them are mild and manageable.
Keep in mind, the list below doesn’t include all possible side effects that can happen with fluconazole. Talk to your prescriber or pharmacist about potential side effects before starting fluconazole.
Headache
This side effect is most common with the single-dose regimen of fluconazole used for vaginal yeast infections.
To relieve a headache, some simple tips may help. Drinking more water, getting rest, and avoiding alcohol may relieve a headache. You can also talk to a healthcare professional about trying an OTC pain medication, such as acetaminophen (Tylenol) or ibuprofen (Advil, Motrin).
Nausea or upset stomach
Nausea is another common side effect of fluconazole.
Taking fluconazole with food should help prevent nausea. But if you’re already feeling nauseated, you can give the BRAT diet (bananas, rice, applesauce, and toast) a go. These foods are easy to digest, so they’re less likely to upset your stomach.
If these dietary measures don’t help, talk to a healthcare professional about trying an anti-nausea medication. Some OTC nausea medications include dimenhydrinate (Dramamine) and bismuth subsalicylate (Pepto-Bismol).
Stomach pain
Fluconazole can sometimes cause stomach pain. To help relieve stomach pain, you can try drinking small amounts of water and eating smaller food portions. Also consider avoiding foods that can make you gassy, such as broccoli and beans. If these tips don’t help, talk to a healthcare professional to see what you should do next.
Diarrhea
If you experience diarrhea with fluconazole, staying hydrated is important. And try to avoid fatty or fibrous foods, which can make diarrhea worse. The BRAT diet may help as well.
OTC antidiarrheal medications, such as loperamide (Imodium A-D), may also be an option. But talk to a healthcare professional before trying an antidiarrheal medication.
More serious side effects
Fluconazole can also cause some rare but serious issues. These include liver problems, serious skin reactions, and allergic reactions.
Liver problems
Fluconazole rarely causes liver damage. It may or may not be reversible after stopping the medication.
Liver damage is more likely if you have existing liver problems or drink a lot of alcohol. It’s also more likely to occur if you need to take fluconazole for a long period of time.
Liver issues may not cause any noticeable symptoms. But if they do appear, symptoms may include yellowing of the skin or eyes (jaundice), dark-colored urine, or abdominal pain. Let your healthcare team know right away if you experience any of these symptoms. They can run a blood test to check your liver function.
Serious skin reactions
A severe rash can be a sign of serious skin conditions, including toxic epidermal necrolysis and Stevens-Johnson syndrome. Seek emergency medical help immediately if you have a severe rash that’s itchy and red all over your body. It may cause your skin to peel or blister.
Allergic reactions and other effects
Fluconazole may cause serious allergic reactions, including anaphylaxis. Anaphylaxis can happen even if you’ve never reacted to fluconazole before. This requires emergency medical attention. Possible symptoms of anaphylaxis include difficulty breathing, hives, and itching. You could also experience swelling of the lips or tongue.
Fluconazole may cause birth defects in an unborn baby or a miscarriage in pregnant women. If you become pregnant, stop fluconazole and talk to your prescriber.
Tips on how to save money with your fluconazole prescription
Fluconazole is widely available as a lower-cost generic. It’s covered by most insurance plans.
If you don’t have insurance or are underinsured, you can save with GoodRx. With a free GoodRx coupon, two fluconazole 150 mg tablets can cost as little as $10.02 at certain pharmacies. And a 14-day supply of fluconazole 100 mg tablets could cost $14.28. A bottle of fluconazole 10 mg/mL oral liquid can cost $30.54 at certain pharmacies with a GoodRx coupon.
Frequently asked questions
Constipation isn’t a common side effect of fluconazole. But some people do report experiencing stomach-related symptoms such as nausea, diarrhea, or stomach pain.
Some people may need to avoid fluconazole or take it with caution. This includes people with certain liver problems, heart rhythm conditions, or those taking medications that strongly interact with fluconazole. It may also not be the best choice during pregnancy. Your healthcare team can help decide if fluconazole is safe for you.
No, fluconazole isn’t an antibiotic. It’s an antifungal medication.
Antibiotics treat bacterial infections, while antifungals treat fungal infections. Bacteria are different from fungi.
Constipation isn’t a common side effect of fluconazole. But some people do report experiencing stomach-related symptoms such as nausea, diarrhea, or stomach pain.
Some people may need to avoid fluconazole or take it with caution. This includes people with certain liver problems, heart rhythm conditions, or those taking medications that strongly interact with fluconazole. It may also not be the best choice during pregnancy. Your healthcare team can help decide if fluconazole is safe for you.
No, fluconazole isn’t an antibiotic. It’s an antifungal medication.
Antibiotics treat bacterial infections, while antifungals treat fungal infections. Bacteria are different from fungi.
The bottom line
Fluconazole (Diflucan) is a prescription antifungal medication that treats and prevents fungal infections. How fast fluconazole works depends on what you’re taking it for. For a vaginal yeast infection, it may start to work within 24 hours. For other infections, it may take several days to notice improvement in your symptoms. You should continue to take fluconazole for as long as your prescriber recommends, even if you start to feel better before your prescription is finished.
Fluconazole is usually taken once a day at the same time each day. You can take it with or without food. If you feel nauseous while taking fluconazole, food might help. Besides nausea, fluconazole can cause side effects such as headache and stomach pain. More serious side effects, such as liver problems, a rash, and anaphylaxis, may also rarely occur.
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References
Glenmark. (2026). Fluconazole tablet [package insert]. DailyMed.
Hospira, Inc. (2025). Fluconazole in sodium chloride injection, solution [package insert]. DailyMed.
MedlinePlus. (2018). Fluconazole.
MedlinePlus. (2024). Abdominal pain.
MedlinePlus. (2024). Peritonitis.
