Drug interactions
Dexamethasone + Methadone
Severity: Moderate
Dexamethasone and Methadone: 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 can induce CYP3A4 and lower methadone concentrations when given over a prolonged period. This may reduce analgesia or provoke opioid withdrawal symptoms in patients on maintenance therapy.
What this interaction means in plain words
Dexamethasone and Methadone 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; Methadone belongs to Musculoskeletal.
Why it happens
Dexamethasone induces CYP3A4, increasing the metabolic clearance of methadone.
What to do
Watch for withdrawal symptoms or loss of pain control when prolonged dexamethasone is started, and increase the methadone dose if needed. Reassess the dose when the steroid is stopped to avoid overdose as induction fades.
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 Methadone
- Alvimopan + Methadone Contraindicated
- Calcium / magnesium / potassium / sodium oxybates + Methadone Contraindicated
- Droperidol + Methadone Contraindicated
- Ibutilide + Methadone Contraindicated
- Isocarboxazid + Methadone Contraindicated
- Lefamulin + Methadone 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 Methadone?
MediHelp rates the interaction as moderate. Dexamethasone and Methadone 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 can induce CYP3A4 and lower methadone concentrations when given over a prolonged period. This may reduce analgesia or provoke opioid withdrawal symptoms in patients on maintenance therapy.
How serious is the interaction between Dexamethasone and Methadone?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Watch for withdrawal symptoms or loss of pain control when prolonged dexamethasone is started, and increase the methadone dose if needed. Reassess the dose when the steroid is stopped to avoid overdose as induction fades.
What other medicines interact with Methadone?
MediHelp also lists interactions of Methadone with, for example, Alvimopan, Calcium / magnesium / potassium / sodium oxybates, Droperidol. The full list is on the Methadone page.
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