Drug interactions
Fluvoxamine + Midazolam intranasal
Severity: Major
Fluvoxamine and Midazolam intranasal: 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
Midazolam is cleared by CYP3A4, and fluvoxamine can raise its levels, deepening and prolonging sedation. Respiratory depression, hypoventilation and apnea are the main concerns.
What this interaction means in plain words
Fluvoxamine and Midazolam intranasal 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
CYP3A4 inhibition by fluvoxamine reduces midazolam clearance, adding to CNS and respiratory depression.
What to do
Monitor respiratory status and sedation level continuously after dosing and have resuscitation equipment available. Consider a lower dose or an alternative benzodiazepine less dependent on CYP3A4.
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 Fluvoxamine
- Agomelatine + Fluvoxamine Contraindicated
- Alosetron + Fluvoxamine Contraindicated
- Fezolinetant + Fluvoxamine Contraindicated
- Fluvoxamine + Isocarboxazid Contraindicated
- Fluvoxamine + Mavacamten Contraindicated
- Fluvoxamine + Methylene blue Contraindicated
Frequently asked questions
Can I take Fluvoxamine with Midazolam intranasal?
MediHelp rates the interaction as major. Fluvoxamine and Midazolam intranasal 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. Midazolam is cleared by CYP3A4, and fluvoxamine can raise its levels, deepening and prolonging sedation. Respiratory depression, hypoventilation and apnea are the main concerns.
How serious is the interaction between Fluvoxamine and Midazolam intranasal?
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 respiratory status and sedation level continuously after dosing and have resuscitation equipment available. Consider a lower dose or an alternative benzodiazepine less dependent on CYP3A4.
What other medicines interact with Fluvoxamine?
MediHelp also lists interactions of Fluvoxamine with, for example, Agomelatine, Alosetron, Fezolinetant. The full list is on the Fluvoxamine page.
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