Drug interactions
Dexamethasone + Pimavanserin
Severity: Moderate
Dexamethasone and Pimavanserin: moderate 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
Pimavanserin is metabolized primarily by CYP3A4, and dexamethasone is a weak-to-moderate inducer. Pimavanserin exposure may be reduced, risking loss of antipsychotic efficacy during longer steroid courses.
What this interaction means in plain words
Dexamethasone and Pimavanserin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Dexamethasone belongs to Endocrine; Pimavanserin belongs to Central Nervous System.
Why it happens
Dexamethasone induces CYP3A4, increasing pimavanserin metabolism.
What to do
Monitor psychotic symptoms during prolonged dexamethasone use and consider increasing the pimavanserin dose if efficacy declines. Reassess dosing when the steroid is stopped.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Dexamethasone
- Bcg vaccine live + Dexamethasone Contraindicated
- Dexamethasone + Mifepristone Contraindicated
- Dexamethasone + Rilpivirine Contraindicated
- Dexamethasone + Smallpox vaccine live Contraindicated
- Dexamethasone + Varicella virus vaccine live Contraindicated
- Dexamethasone + Yellow fever vaccine Contraindicated
Other interactions of Pimavanserin
- Lefamulin + Pimavanserin Contraindicated
- Pimavanserin + Pimozide Contraindicated
- Pimavanserin + Vandetanib Contraindicated
- Adagrasib + Pimavanserin Major
- Amiodarone + Pimavanserin Major
- Amisulpride + Pimavanserin Major
Frequently asked questions
Can I take Dexamethasone with Pimavanserin?
MediHelp rates the interaction as moderate. Dexamethasone and Pimavanserin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Pimavanserin is metabolized primarily by CYP3A4, and dexamethasone is a weak-to-moderate inducer. Pimavanserin exposure may be reduced, risking loss of antipsychotic efficacy during longer steroid courses.
How serious is the interaction between Dexamethasone and Pimavanserin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor psychotic symptoms during prolonged dexamethasone use and consider increasing the pimavanserin dose if efficacy declines. Reassess dosing when the steroid is stopped.
What other medicines interact with Dexamethasone?
MediHelp also lists interactions of Dexamethasone with, for example, Bcg vaccine live, Mifepristone, Rilpivirine. The full list is on the Dexamethasone page.
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