Drug interactions
Dexamethasone-tobramycin + Methoxyflurane
Severity: Major
Dexamethasone-tobramycin and Methoxyflurane: major interaction.
Last updated Sources: Health Canada product monograph
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
Methoxyflurane releases fluoride that is nephrotoxic, and tobramycin is also nephrotoxic, so combined systemic use increases the risk of acute kidney injury. Anesthetic doses in particular are a concern; low-dose analgesic use carries less risk, and topical tobramycin adds little.
What this interaction means in plain words
Dexamethasone-tobramycin and Methoxyflurane can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive nephrotoxicity from fluoride-mediated tubular injury and aminoglycoside accumulation in proximal tubular cells.
What to do
Avoid methoxyflurane with systemic tobramycin where possible; if combined, monitor renal function and tobramycin levels.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Dexamethasone-tobramycin
Frequently asked questions
Can I take Dexamethasone-tobramycin with Methoxyflurane?
MediHelp rates the interaction as major. Dexamethasone-tobramycin and Methoxyflurane can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Methoxyflurane releases fluoride that is nephrotoxic, and tobramycin is also nephrotoxic, so combined systemic use increases the risk of acute kidney injury. Anesthetic doses in particular are a concern; low-dose analgesic use carries less risk, and topical tobramycin adds little.
How serious is the interaction between Dexamethasone-tobramycin and Methoxyflurane?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid methoxyflurane with systemic tobramycin where possible; if combined, monitor renal function and tobramycin levels.
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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