Drug interactions
Dexamethasone-tobramycin + Trimagnesium
Severity: Moderate
Dexamethasone-tobramycin and Trimagnesium: 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
Magnesium and aminoglycosides both impair neuromuscular transmission, so systemic combination can cause additive weakness and rarely respiratory paralysis. Oral magnesium citrate has limited absorption, and topical tobramycin has minimal systemic exposure, so the risk is low in those settings.
What this interaction means in plain words
Dexamethasone-tobramycin and Trimagnesium 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.
Why it happens
Additive inhibition of neuromuscular transmission via reduced presynaptic acetylcholine release.
What to do
Monitor for muscle weakness and respiratory function when systemic aminoglycosides are used with magnesium, especially in renal impairment. Check magnesium levels if parenteral magnesium is given.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Dexamethasone-tobramycin and Trimagnesium, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
Other interactions of Dexamethasone-tobramycin
Frequently asked questions
Can I take Dexamethasone-tobramycin with Trimagnesium?
MediHelp rates the interaction as moderate. Dexamethasone-tobramycin and Trimagnesium 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. Magnesium and aminoglycosides both impair neuromuscular transmission, so systemic combination can cause additive weakness and rarely respiratory paralysis. Oral magnesium citrate has limited absorption, and topical tobramycin has minimal systemic exposure, so the risk is low in those settings.
How serious is the interaction between Dexamethasone-tobramycin and Trimagnesium?
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 for muscle weakness and respiratory function when systemic aminoglycosides are used with magnesium, especially in renal impairment. Check magnesium levels if parenteral magnesium is given.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
