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Can I take Buspirone and Fluvoxamine together?

Drug interaction guide

Taking these two medicines together can significantly increase the levels of buspirone in your blood. This makes you much more likely to experience side effects such as dizziness, drowsiness, nausea, headache, and feeling light-headed. There is also a small risk of a rare but serious condition called serotonin syndrome, which can cause shivering, sweating, confusion, and a fast heartbeat.

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Why this happens

Fluvoxamine blocks a specific enzyme in your liver (called CYP3A4) that is responsible for breaking down buspirone. Because the liver cannot clear the buspirone as quickly as usual, the medicine builds up in your system. Additionally, both drugs affect a chemical in the brain called serotonin, which can lead to an additive effect.

You should speak to your doctor before taking these two medicines together. If your doctor decides you need both, they may need to prescribe a much lower dose of buspirone than usual. Contact your doctor immediately if you feel unusually dizzy, drowsy, or if you experience tremors or agitation.

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Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.

Disclaimer

This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.

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Article history

The information on this page is written and peer reviewed by qualified clinicians.

  • 14 Mar 2026 | Originally published
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