Drug interactions
Amiodarone + Dexamethasone-tobramycin
Severity: Moderate
Amiodarone and Dexamethasone-tobramycin: 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
Amiodarone inhibits P-glycoprotein and may raise exposure to dexamethasone, while dexamethasone can induce CYP3A4 and lower amiodarone concentrations. The changes are generally modest, but reduced amiodarone effect or increased corticosteroid effect may occur. The tobramycin component is not expected to contribute meaningfully through this route.
What this interaction means in plain words
Amiodarone and Dexamethasone-tobramycin 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.
Amiodarone belongs to Cardiovascular; Dexamethasone-tobramycin belongs to Anti Bacterial.
Why it happens
Dexamethasone induces CYP3A4, increasing amiodarone metabolism, and amiodarone inhibits P-glycoprotein efflux of dexamethasone.
What to do
Monitor heart rhythm and clinical antiarrhythmic response, and consider amiodarone levels or dose adjustment during prolonged dexamethasone therapy. Watch for corticosteroid adverse effects if amiodarone is started.
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-tobramycin
Other interactions of Amiodarone
- Amiodarone + Amisulpride Contraindicated
- Amiodarone + Arsenic trioxide Contraindicated
- Amiodarone + Dofetilide Contraindicated
- Amiodarone + Dronedarone Contraindicated
- Amiodarone + Droperidol Contraindicated
- Amiodarone + Eliglustat Contraindicated
Frequently asked questions
Can I take Amiodarone with Dexamethasone-tobramycin?
MediHelp rates the interaction as moderate. Amiodarone and Dexamethasone-tobramycin 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. Amiodarone inhibits P-glycoprotein and may raise exposure to dexamethasone, while dexamethasone can induce CYP3A4 and lower amiodarone concentrations. The changes are generally modest, but reduced amiodarone effect or increased corticosteroid effect may occur. The tobramycin component is not expected to contribute meaningfully through this route.
How serious is the interaction between Amiodarone and Dexamethasone-tobramycin?
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 heart rhythm and clinical antiarrhythmic response, and consider amiodarone levels or dose adjustment during prolonged dexamethasone therapy. Watch for corticosteroid adverse effects if amiodarone is started.
What other medicines interact with Dexamethasone-tobramycin?
MediHelp also lists interactions of Dexamethasone-tobramycin with, for example, Capreomycin, Carboplatin, Ciprofloxacin. The full list is on the Dexamethasone-tobramycin page.
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