Drug interactions
Phenobarbital + Tapentadol
Severity: Major
Phenobarbital and Tapentadol: 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
Phenobarbital with tapentadol can cause profound sedation and respiratory depression. Phenobarbital also induces hepatic enzymes, which may alter opioid exposure over time.
What this interaction means in plain words
Phenobarbital and Tapentadol 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 through GABA-A potentiation and opioid agonism, plus enzyme induction by phenobarbital.
What to do
Use the lowest effective doses and monitor respiratory status and sedation, especially when starting or changing doses. Reassess analgesic effect over time because of enzyme induction.
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 Tapentadol
- Calcium / magnesium / potassium / sodium oxybates + Tapentadol Contraindicated
- Isocarboxazid + Tapentadol Contraindicated
- Linezolid + Tapentadol Contraindicated
- Methylene blue + Tapentadol Contraindicated
- Olanzapine / samidorphan + Tapentadol Contraindicated
- Phenelzine + Tapentadol Contraindicated
Frequently asked questions
Can I take Phenobarbital with Tapentadol?
MediHelp rates the interaction as major. Phenobarbital and Tapentadol 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. Phenobarbital with tapentadol can cause profound sedation and respiratory depression. Phenobarbital also induces hepatic enzymes, which may alter opioid exposure over time.
How serious is the interaction between Phenobarbital and Tapentadol?
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 doses and monitor respiratory status and sedation, especially when starting or changing doses. Reassess analgesic effect over time because of enzyme induction.
What other medicines interact with Tapentadol?
MediHelp also lists interactions of Tapentadol with, for example, Calcium / magnesium / potassium / sodium oxybates, Isocarboxazid, Linezolid. The full list is on the Tapentadol page.
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