Drug interactions
Fentanyl intranasal + Verapamil
Severity: Major
Fentanyl intranasal and Verapamil: major 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
Verapamil inhibits CYP3A4 and can increase fentanyl exposure and prolong its effect. This raises the risk of respiratory depression and excessive sedation.
What this interaction means in plain words
Fentanyl intranasal and Verapamil 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.
Why it happens
Verapamil inhibits CYP3A4-mediated fentanyl metabolism, reducing clearance.
What to do
Monitor closely for respiratory depression and sedation and reduce the fentanyl dose as needed. Consider an opioid not dependent on CYP3A4 if prolonged combined use is needed.
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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Other interactions of Verapamil
- Dofetilide + Verapamil Contraindicated
- Flibanserin + Verapamil Contraindicated
- Lomitapide + Verapamil Contraindicated
- Lonafarnib + Verapamil Contraindicated
- Pimozide + Verapamil Contraindicated
- Acebutolol + Verapamil Major
Frequently asked questions
Can I take Fentanyl intranasal with Verapamil?
MediHelp rates the interaction as major. Fentanyl intranasal and Verapamil 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. Verapamil inhibits CYP3A4 and can increase fentanyl exposure and prolong its effect. This raises the risk of respiratory depression and excessive sedation.
How serious is the interaction between Fentanyl intranasal and Verapamil?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor closely for respiratory depression and sedation and reduce the fentanyl dose as needed. Consider an opioid not dependent on CYP3A4 if prolonged combined use is needed.
What other medicines interact with Verapamil?
MediHelp also lists interactions of Verapamil with, for example, Dofetilide, Flibanserin, Lomitapide. The full list is on the Verapamil page.
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