Drug interactions
Pirtobrutinib + Valproic acid
Severity: Minor
Pirtobrutinib and Valproic acid: 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
Pirtobrutinib inhibits some CYP enzymes, but valproate is cleared mainly by glucuronidation and beta-oxidation, so a significant increase in its levels is unlikely. Both agents may be associated with cytopenias or bleeding tendencies.
What this interaction means in plain words
Pirtobrutinib and Valproic acid have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Pirtobrutinib belongs to Oncology; Valproic acid belongs to Central Nervous System.
Why it happens
Possible weak CYP2C19 inhibition affecting a minor valproate pathway; additive hematologic effects are theoretical.
What to do
No dose adjustment is routinely needed. Monitor platelet counts and bleeding signs, and check valproate levels if toxicity is suspected.
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?
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Other interactions of Valproic acid
- Ertapenem + Valproic acid Contraindicated
- Imipenem / cilastatin / relebactam + Valproic acid Contraindicated
- Imipenem / cilastatin + Valproic acid Contraindicated
- Meropenem / vaborbactam + Valproic acid Contraindicated
- Meropenem + Valproic acid Contraindicated
- Calcium / magnesium / potassium / sodium oxybates + Valproic acid Major
Other interactions of Pirtobrutinib
Frequently asked questions
Can I take Pirtobrutinib with Valproic acid?
MediHelp rates the interaction as minor. Pirtobrutinib and Valproic acid have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Pirtobrutinib inhibits some CYP enzymes, but valproate is cleared mainly by glucuronidation and beta-oxidation, so a significant increase in its levels is unlikely. Both agents may be associated with cytopenias or bleeding tendencies.
How serious is the interaction between Pirtobrutinib and Valproic acid?
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 dose adjustment is routinely needed. Monitor platelet counts and bleeding signs, and check valproate levels if toxicity is suspected.
What other medicines interact with Valproic acid?
MediHelp also lists interactions of Valproic acid with, for example, Ertapenem, Imipenem / cilastatin / relebactam, Imipenem / cilastatin. The full list is on the Valproic acid page.
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