Drug interactions
Clozapine + Dexamethasone
Severity: Moderate
Clozapine and Dexamethasone: 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
Dexamethasone is a CYP3A4 inducer and may modestly lower clozapine concentrations, potentially reducing antipsychotic control. Corticosteroids can also worsen hyperglycemia and psychiatric symptoms. The size of the effect is variable and CYP3A4 is only a secondary route for clozapine.
What this interaction means in plain words
Clozapine and Dexamethasone 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.
Clozapine belongs to Central Nervous System; Dexamethasone belongs to Endocrine.
Why it happens
Possible CYP3A4 induction by dexamethasone increasing clozapine metabolism.
What to do
Monitor psychiatric status and consider clozapine levels during prolonged dexamethasone courses. Also monitor blood glucose.
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 Clozapine
- Clozapine + Deferiprone Contraindicated
- Clozapine + Irinotecan Contraindicated
- Clozapine + Pimozide Contraindicated
- Clozapine + Thioridazine Contraindicated
- Acalabrutinib + Clozapine Major
- Adagrasib + Clozapine Major
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
Frequently asked questions
Can I take Clozapine with Dexamethasone?
MediHelp rates the interaction as moderate. Clozapine and Dexamethasone 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 is a CYP3A4 inducer and may modestly lower clozapine concentrations, potentially reducing antipsychotic control. Corticosteroids can also worsen hyperglycemia and psychiatric symptoms. The size of the effect is variable and CYP3A4 is only a secondary route for clozapine.
How serious is the interaction between Clozapine and Dexamethasone?
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 psychiatric status and consider clozapine levels during prolonged dexamethasone courses. Also monitor blood glucose.
What other medicines interact with Clozapine?
MediHelp also lists interactions of Clozapine with, for example, Deferiprone, Irinotecan, Pimozide. The full list is on the Clozapine page.
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