Drug interactions
Pentobarbital + Tramadol
Severity: Major
Pentobarbital 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
Pentobarbital is a barbiturate that depresses the central nervous system, and combined with tramadol it can cause profound sedation and respiratory depression. Barbiturates also induce hepatic enzymes and may lower tramadol and O-desmethyltramadol exposure, reducing analgesia. Barbiturates may also lower the seizure threshold on withdrawal, and tramadol itself carries seizure risk.
What this interaction means in plain words
Pentobarbital 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.
Why it happens
Additive CNS and respiratory depression, plus CYP3A4/CYP2B6 induction by pentobarbital that accelerates tramadol metabolism.
What to do
Avoid the combination where possible; if used, give the lowest doses and monitor sedation and respiratory rate. Reassess analgesic response and be alert to altered tramadol effect when the barbiturate is started or stopped.
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
Frequently asked questions
Can I take Pentobarbital with Tramadol?
MediHelp rates the interaction as major. Pentobarbital 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. Pentobarbital is a barbiturate that depresses the central nervous system, and combined with tramadol it can cause profound sedation and respiratory depression. Barbiturates also induce hepatic enzymes and may lower tramadol and O-desmethyltramadol exposure, reducing analgesia. Barbiturates may also lower the seizure threshold on withdrawal, and tramadol itself carries seizure risk.
How serious is the interaction between Pentobarbital 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: Avoid the combination where possible; if used, give the lowest doses and monitor sedation and respiratory rate. Reassess analgesic response and be alert to altered tramadol effect when the barbiturate is started or stopped.
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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