Drug interactions
Dexamethasone-tobramycin + Neomycin po
Severity: Moderate
Dexamethasone-tobramycin and Neomycin po: 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
Oral neomycin is poorly absorbed, but absorption can increase with damaged gut mucosa or renal impairment. Combined with tobramycin, which is also oto- and nephrotoxic, this can add to kidney and inner-ear injury when tobramycin is given systemically. With topical or ophthalmic tobramycin, systemic exposure is minimal and the risk is low.
What this interaction means in plain words
Dexamethasone-tobramycin and Neomycin po 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 nephrotoxic and ototoxic effects of two aminoglycosides.
What to do
Avoid combining systemic aminoglycosides with oral neomycin where possible. If used, monitor renal function, aminoglycoside levels and hearing, particularly in renal impairment.
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?
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Other interactions of Dexamethasone-tobramycin
Frequently asked questions
Can I take Dexamethasone-tobramycin with Neomycin po?
MediHelp rates the interaction as moderate. Dexamethasone-tobramycin and Neomycin po 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. Oral neomycin is poorly absorbed, but absorption can increase with damaged gut mucosa or renal impairment. Combined with tobramycin, which is also oto- and nephrotoxic, this can add to kidney and inner-ear injury when tobramycin is given systemically. With topical or ophthalmic tobramycin, systemic exposure is minimal and the risk is low.
How serious is the interaction between Dexamethasone-tobramycin and Neomycin po?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining systemic aminoglycosides with oral neomycin where possible. If used, monitor renal function, aminoglycoside levels and hearing, particularly in renal impairment.
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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