Drug interactions
Dexamethasone-tobramycin + Metyrapone
Severity: Minor
Dexamethasone-tobramycin and Metyrapone: 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
Metyrapone blocks cortisol synthesis and is used diagnostically by measuring the rise in ACTH and 11-deoxycortisol. Dexamethasone suppresses the pituitary-adrenal axis, so it can blunt the response and make the test unreliable. Topical ophthalmic use would have far less effect than systemic use.
What this interaction means in plain words
Dexamethasone-tobramycin and Metyrapone 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-tobramycin belongs to Anti Bacterial; Metyrapone belongs to Endocrine.
Why it happens
Exogenous corticosteroid suppresses ACTH release through negative feedback, opposing the compensatory ACTH rise that metyrapone relies on.
What to do
Avoid systemic dexamethasone before and during metyrapone testing, or interpret results with the steroid exposure in mind. Use an alternative assessment method if corticosteroid therapy cannot be stopped.
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 Dexamethasone-tobramycin
Other interactions of Metyrapone
- Metyrapone + Pacritinib Major
- Budesonide + Metyrapone Moderate
- Cortisone + Metyrapone Moderate
- Cyproheptadine + Metyrapone Moderate
- Deflazacort + Metyrapone Moderate
- Desogestrel-ethinyl estradiol + Metyrapone Moderate
Frequently asked questions
Can I take Dexamethasone-tobramycin with Metyrapone?
MediHelp rates the interaction as minor. Dexamethasone-tobramycin and Metyrapone have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Metyrapone blocks cortisol synthesis and is used diagnostically by measuring the rise in ACTH and 11-deoxycortisol. Dexamethasone suppresses the pituitary-adrenal axis, so it can blunt the response and make the test unreliable. Topical ophthalmic use would have far less effect than systemic use.
How serious is the interaction between Dexamethasone-tobramycin and Metyrapone?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid systemic dexamethasone before and during metyrapone testing, or interpret results with the steroid exposure in mind. Use an alternative assessment method if corticosteroid therapy cannot be stopped.
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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