Drug interactions
Flibanserin + Nirmatrelvir / ritonavir
Severity: Contraindicated
Flibanserin and Nirmatrelvir / ritonavir: contraindicated 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 strong CYP3A4 inhibitor and can sharply increase flibanserin concentrations. This may cause severe hypotension, syncope and CNS depression.
What this interaction means in plain words
Flibanserin and Nirmatrelvir / ritonavir are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Why it happens
Ritonavir strongly inhibits CYP3A4, decreasing flibanserin metabolism.
What to do
Do not co-administer; hold flibanserin during the course and for several days after, in line with product labeling.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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References
Other interactions of Flibanserin
- Atazanavir + Flibanserin Contraindicated
- Ceritinib + Flibanserin Contraindicated
- Clarithromycin + Flibanserin Contraindicated
- Cobicistat + Flibanserin Contraindicated
- Conivaptan + Flibanserin Contraindicated
- Crizotinib + Flibanserin Contraindicated
Frequently asked questions
Can I take Flibanserin with Nirmatrelvir / ritonavir?
MediHelp rates the interaction as contraindicated. Flibanserin and Nirmatrelvir / ritonavir are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Ritonavir is a strong CYP3A4 inhibitor and can sharply increase flibanserin concentrations. This may cause severe hypotension, syncope and CNS depression.
How serious is the interaction between Flibanserin and Nirmatrelvir / ritonavir?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not co-administer; hold flibanserin during the course and for several days after, in line with product labeling.
What other medicines interact with Flibanserin?
MediHelp also lists interactions of Flibanserin with, for example, Atazanavir, Ceritinib, Clarithromycin. The full list is on the Flibanserin page.
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