Drug interactions
Gentamicin + Tobramycin inhaled
Severity: Major
Gentamicin and Tobramycin inhaled: 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 are aminoglycosides, and inhaled tobramycin has some systemic absorption, particularly with renal impairment or damaged airways. Combining them adds to cumulative nephrotoxicity, ototoxicity and neuromuscular blockade risk.
What this interaction means in plain words
Gentamicin and Tobramycin inhaled 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 aminoglycoside toxicity affecting the kidney, the cochlea and vestibular system, and the neuromuscular junction.
What to do
Avoid concurrent or sequential use where possible. If unavoidable, monitor serum creatinine, tobramycin and gentamicin levels, and hearing.
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 Tobramycin inhaled?
MediHelp rates the interaction as major. Gentamicin and Tobramycin inhaled 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 are aminoglycosides, and inhaled tobramycin has some systemic absorption, particularly with renal impairment or damaged airways. Combining them adds to cumulative nephrotoxicity, ototoxicity and neuromuscular blockade risk.
How serious is the interaction between Gentamicin and Tobramycin inhaled?
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 concurrent or sequential use where possible. If unavoidable, monitor serum creatinine, tobramycin and gentamicin levels, and hearing.
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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