Drug interactions
Buspirone + Ritonavir
Severity: Major
Buspirone and Ritonavir: major interaction.
Last updated Sources: US FDA label
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Ritonavir is a potent CYP3A4 inhibitor and can sharply raise buspirone exposure. This increases the risk of excessive sedation, dizziness, nausea and serotonergic effects.
What this interaction means in plain words
Buspirone and Ritonavir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Buspirone belongs to Central Nervous System; Ritonavir belongs to Anti Virals.
Why it happens
Ritonavir potently inhibits CYP3A4-mediated first-pass and systemic metabolism of buspirone.
What to do
Start buspirone at a very low dose and titrate slowly, or choose an alternative anxiolytic. Monitor closely for sedation and serotonin toxicity.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Buspirone
- Buspirone + Isocarboxazid Contraindicated
- Buspirone + Linezolid Contraindicated
- Buspirone + Phenelzine Contraindicated
- Buspirone + Procarbazine Contraindicated
- Buspirone + Selegiline Contraindicated
- Buspirone + Selegiline transdermal Contraindicated
Other interactions of Ritonavir
- Alfuzosin + Ritonavir Contraindicated
- Amiodarone + Ritonavir Contraindicated
- Avanafil + Ritonavir Contraindicated
- Colchicine + Ritonavir Contraindicated
- Dronedarone + Ritonavir Contraindicated
- Eletriptan + Ritonavir Contraindicated
Frequently asked questions
Can I take Buspirone with Ritonavir?
MediHelp rates the interaction as major. Buspirone and Ritonavir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Ritonavir is a potent CYP3A4 inhibitor and can sharply raise buspirone exposure. This increases the risk of excessive sedation, dizziness, nausea and serotonergic effects.
How serious is the interaction between Buspirone and Ritonavir?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Start buspirone at a very low dose and titrate slowly, or choose an alternative anxiolytic. Monitor closely for sedation and serotonin toxicity.
What other medicines interact with Buspirone?
MediHelp also lists interactions of Buspirone with, for example, Isocarboxazid, Linezolid, Phenelzine. The full list is on the Buspirone page.
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