Fluconazole is an antifungal medication. Doctors prescribe fluconazole to treat fungal and yeast infections, such as vaginal candidiasis and other candida infections, including those affecting the urinary tract.
Fluconazole comes in different forms, including oral tablets, oral suspension, and injection. It is available as a generic drug or under the brand name Diflucan.
Like most medications, fluconazole can cause side effects. While mild effects like nausea may go away within a few days, serious side effects may last longer and require prompt medical attention.
Fluconazole side effects and duration
Fluconazole is generally well-tolerated, but like many other medications, it can cause side effects. Commonly reported side effects include:
- headaches
- nausea
- abdominal pain
- diarrhea
- skin rash
Fluconazole can also cause vaginal irritation when prescribed to treat vaginal yeast infections.
Fluconazole side effects in adults may include increased levels of liver enzymes. A liver enzyme is a protein that speeds up chemical reactions in the liver, helping it perform its functions. In rare cases, fluconazole may cause serious liver damage. Symptoms of liver damage include jaundice, fatigue, and abdominal pain.
Other rare but serious side effects of fluconazole include:
- Liver damage: Fluconazole can cause liver toxicity, which, while rare, can be serious. Although this is reversible in most cases, it may take up to 3 to 4 months after stopping the medication for regular liver function to return.
- Heart rhythm changes: Fluconazole can affect the electrical activity of the heart, a condition known as QT prolongation, which affects the heart’s rhythm. This side effect may improve after stopping the medication.
- Seizures: Although it’s uncommon, fluconazole can increase the risk of seizures. This is more likely in people with a history of seizures or who are taking other medications that also increase the risk for seizures.
- Decreased adrenal gland function: Fluconazole can affect the way your adrenal glands work, which may lead to a condition called adrenal insufficiency. This condition typically improves after stopping the medication, but it could take time for adrenal function to fully recover.
- Stevens-Johnson syndrome: Fluconazole can cause a severe skin reaction called Stevens-Johnson syndrome. These reactions are medical emergencies and require immediate attention.
Generally, fluconazole side effects can vary in duration, depending on your dosage and for how long you take the medication.
Mild to moderate side effects, such as nausea, vomiting, or headache, usually go away within a few days after starting treatment or after you stop taking it.
Serious side effects, particularly those related to your liver or severe skin reactions, may last longer depending on the severity of the reaction.
Does fluconazole have any long-term side effects?
Yes, fluconazole can have long-term side effects, although it’s generally rare. Long-term side effects are more likely to occur if you are taking fluconazole for a long time or if you are taking a higher dosage.
Long-term side effects may include:
- chronic liver damage
- heart rhythm changes like QT prolongation and irregular heartbeats
- adrenal insufficiency
- skin reactions like rashes or Stevens-Johnson syndrome (in rare cases)
- resistance to fluconazole, especially when treating chronic fungal infections
How long does fluconazole stay in your system?
Fluconazole is known for its ability to stay in the body for longer periods than other antifungal medications.
But, this can vary depending on several factors, including:
- the dose of fluconazole that you’re taking
- how long you take fluconazole
- your metabolism
- your liver and kidney function
- your age
Fluconazole usually only stays in your body for around 5 to 7 days after your last dose.
But this can differ from person to person. For example, in people with compromised liver or kidney function, the medication might take longer to be fully removed from the body.
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Get free cardWhat can you do to avoid side effects with fluconazole?
To avoid or minimize side effects while taking fluconazole, consider these tips:
- Follow the prescribed dosage: Always take fluconazole exactly as prescribed by your doctor. Avoid taking more, as higher doses can increase the risk of side effects.
- Stay hydrated: Drinking lots of water can help support your kidneys in processing and eliminating the medication from your body. This may help reduce the risk of side effects.
- Regular check-ups: If you are on long-term fluconazole therapy, you may need regular blood tests to check how well your liver is working. This can help identify possible liver side effects early.
- Drug interactions: Tell your doctor about all medications and supplements you are taking. This can help reduce the risk of potential interactions and side effects.
- Take with food: Taking fluconazole with food may help reduce gastrointestinal side effects such as nausea and upset stomach.
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Summary
Fluconazole is an effective antifungal medication, but like any other medication, it can cause side effects. Some of the more common side effects of fluconazole include nausea, vomiting, and headaches.
Most side effects are mild and temporary. But in rare cases, serious side effects like liver damage can occur. Always monitor your symptoms and talk with your doctor if you experience severe side effects or side effects that don’t go away.