Drug interactions
Ondansetron + Pentobarbital
Severity: Minor
Ondansetron and Pentobarbital: minor 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 induces hepatic enzymes including CYP3A4 and may lower ondansetron concentrations. The clinical effect is generally modest because multiple pathways clear ondansetron.
What this interaction means in plain words
Ondansetron and Pentobarbital have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Enzyme induction by pentobarbital increases ondansetron metabolism.
What to do
No empirical dose change is required. Assess antiemetic response and add or switch agents if control is inadequate.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Ondansetron and Pentobarbital, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Ondansetron
- Apomorphine + Ondansetron Contraindicated
- Ondansetron + Thioridazine Contraindicated
- Ondansetron + Vandetanib Contraindicated
- Adagrasib + Ondansetron Major
- Amiodarone + Ondansetron Major
- Amisulpride + Ondansetron Major
Frequently asked questions
Can I take Ondansetron with Pentobarbital?
MediHelp rates the interaction as minor. Ondansetron and Pentobarbital have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Pentobarbital induces hepatic enzymes including CYP3A4 and may lower ondansetron concentrations. The clinical effect is generally modest because multiple pathways clear ondansetron.
How serious is the interaction between Ondansetron and Pentobarbital?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No empirical dose change is required. Assess antiemetic response and add or switch agents if control is inadequate.
What other medicines interact with Ondansetron?
MediHelp also lists interactions of Ondansetron with, for example, Apomorphine, Thioridazine, Vandetanib. The full list is on the Ondansetron page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
