Drug interactions
Avanafil + Conivaptan
Severity: Contraindicated
Avanafil and Conivaptan: contraindicated interaction.
Last updated
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
Conivaptan is a strong CYP3A4 inhibitor and can markedly raise avanafil levels. Excess PDE5 inhibition may cause severe hypotension, syncope, visual changes and priapism.
What this interaction means in plain words
Avanafil and Conivaptan 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
CYP3A4 inhibition by conivaptan decreases avanafil clearance.
What to do
Avoid avanafil during conivaptan therapy. Use an alternative erectile dysfunction treatment if needed.
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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Other interactions of Avanafil
- Amyl nitrite + Avanafil Contraindicated
- Atazanavir + Avanafil Contraindicated
- Avanafil + Clarithromycin Contraindicated
- Avanafil + Darunavir Contraindicated
- Avanafil + Fosamprenavir Contraindicated
- Avanafil + Indinavir Contraindicated
Frequently asked questions
Can I take Avanafil with Conivaptan?
MediHelp rates the interaction as contraindicated. Avanafil and Conivaptan 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. Conivaptan is a strong CYP3A4 inhibitor and can markedly raise avanafil levels. Excess PDE5 inhibition may cause severe hypotension, syncope, visual changes and priapism.
How serious is the interaction between Avanafil and Conivaptan?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid avanafil during conivaptan therapy. Use an alternative erectile dysfunction treatment if needed.
What other medicines interact with Avanafil?
MediHelp also lists interactions of Avanafil with, for example, Amyl nitrite, Atazanavir, Clarithromycin. The full list is on the Avanafil page.
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