Drug interactions
Dexamethasone + Simvastatin
Severity: Minor
Dexamethasone and Simvastatin: 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
Dexamethasone is a weak to moderate CYP3A4 inducer and may lower simvastatin exposure. The clinical effect is generally modest, especially with short courses.
What this interaction means in plain words
Dexamethasone and Simvastatin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Dexamethasone belongs to Endocrine; Simvastatin belongs to Cardiovascular.
Why it happens
Dexamethasone induces CYP3A4, increasing simvastatin clearance.
What to do
No routine adjustment is needed for short courses. Reassess lipids if prolonged high-dose dexamethasone is used.
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 Simvastatin
- Atazanavir + Simvastatin Contraindicated
- Clarithromycin + Simvastatin Contraindicated
- Cobicistat + Simvastatin Contraindicated
- Cyclosporin + Simvastatin Contraindicated
- Danazol + Simvastatin Contraindicated
- Darunavir + Simvastatin Contraindicated
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 Dexamethasone with Simvastatin?
MediHelp rates the interaction as minor. Dexamethasone and Simvastatin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Dexamethasone is a weak to moderate CYP3A4 inducer and may lower simvastatin exposure. The clinical effect is generally modest, especially with short courses.
How serious is the interaction between Dexamethasone and Simvastatin?
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 routine adjustment is needed for short courses. Reassess lipids if prolonged high-dose dexamethasone is used.
What other medicines interact with Simvastatin?
MediHelp also lists interactions of Simvastatin with, for example, Atazanavir, Clarithromycin, Cobicistat. The full list is on the Simvastatin page.
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