Drug interactions
Ritonavir + Tramadol
Severity: Major
Ritonavir and Tramadol: 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
Ritonavir inhibits CYP3A4 and CYP2D6, which can raise tramadol concentrations. Higher parent drug exposure increases the risk of seizures, serotonin syndrome and CNS or respiratory depression, while reduced CYP2D6 activation may lessen analgesia.
What this interaction means in plain words
Ritonavir and Tramadol 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 belongs to Anti Virals; Tramadol belongs to Musculoskeletal.
Why it happens
Inhibition of CYP3A4 (and CYP2D6) by ritonavir reduces tramadol clearance and alters metabolite formation.
What to do
Use the lowest effective tramadol dose or select a different analgesic. Monitor for sedation, respiratory depression, serotonergic signs and seizures.
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 Tramadol
- Isocarboxazid + Tramadol Contraindicated
- Olanzapine / samidorphan + Tramadol Contraindicated
- Phenelzine + Tramadol Contraindicated
- Procarbazine + Tramadol Contraindicated
- Rasagiline + Tramadol Contraindicated
- Safinamide + Tramadol 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 Ritonavir with Tramadol?
MediHelp rates the interaction as major. Ritonavir and Tramadol 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 inhibits CYP3A4 and CYP2D6, which can raise tramadol concentrations. Higher parent drug exposure increases the risk of seizures, serotonin syndrome and CNS or respiratory depression, while reduced CYP2D6 activation may lessen analgesia.
How serious is the interaction between Ritonavir and Tramadol?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective tramadol dose or select a different analgesic. Monitor for sedation, respiratory depression, serotonergic signs and seizures.
What other medicines interact with Tramadol?
MediHelp also lists interactions of Tramadol with, for example, Isocarboxazid, Olanzapine / samidorphan, Phenelzine. The full list is on the Tramadol page.
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