Drug interactions
Gentamicin + Magnesium supplement
Severity: Major
Gentamicin and Magnesium supplement: major 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
Both aminoglycosides and magnesium impair neuromuscular transmission, so combined use can increase muscle weakness and, in severe cases, respiratory depression. The risk is greatest with parenteral magnesium, in renal impairment, or with neuromuscular disease. Gentamicin may also cause renal magnesium wasting.
What this interaction means in plain words
Gentamicin and Magnesium supplement 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 neuromuscular blockade through reduced presynaptic acetylcholine release and decreased postsynaptic sensitivity.
What to do
Avoid combining parenteral magnesium with gentamicin where possible, or monitor respiratory function and neuromuscular status closely. Check serum magnesium and adjust doses.
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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Other interactions of Gentamicin
- Cidofovir + Gentamicin Contraindicated
- Adefovir + Gentamicin Major
- Amikacin + Gentamicin Major
- Amlodipine-hydrochlorothiazide-valsartan + Gentamicin Major
- Amphotericin b deoxycholate + Gentamicin Major
- Amphotericin b + Gentamicin Major
Frequently asked questions
Can I take Gentamicin with Magnesium supplement?
MediHelp rates the interaction as major. Gentamicin and Magnesium supplement 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. Both aminoglycosides and magnesium impair neuromuscular transmission, so combined use can increase muscle weakness and, in severe cases, respiratory depression. The risk is greatest with parenteral magnesium, in renal impairment, or with neuromuscular disease. Gentamicin may also cause renal magnesium wasting.
How serious is the interaction between Gentamicin and Magnesium supplement?
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 combining parenteral magnesium with gentamicin where possible, or monitor respiratory function and neuromuscular status closely. Check serum magnesium and adjust doses.
What other medicines interact with Gentamicin?
MediHelp also lists interactions of Gentamicin with, for example, Cidofovir, Adefovir, Amikacin. The full list is on the Gentamicin page.
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