Drug interactions
Dexamethasone-tobramycin + Erythromycin ethylsuccinate
Severity: Minor
Dexamethasone-tobramycin and Erythromycin ethylsuccinate: minor 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
Erythromycin inhibits CYP3A4 and can raise systemic dexamethasone exposure, increasing corticosteroid adverse effects. With the ophthalmic or topical combination product, systemic absorption is low, so the practical effect is usually small.
What this interaction means in plain words
Dexamethasone-tobramycin and Erythromycin ethylsuccinate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Erythromycin inhibits CYP3A4-mediated metabolism of dexamethasone.
What to do
No routine change is needed with topical or ophthalmic dexamethasone-tobramycin; if systemic exposure is substantial, watch for corticosteroid excess such as hyperglycemia and fluid retention.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Dexamethasone-tobramycin
Frequently asked questions
Can I take Dexamethasone-tobramycin with Erythromycin ethylsuccinate?
MediHelp rates the interaction as minor. Dexamethasone-tobramycin and Erythromycin ethylsuccinate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Erythromycin inhibits CYP3A4 and can raise systemic dexamethasone exposure, increasing corticosteroid adverse effects. With the ophthalmic or topical combination product, systemic absorption is low, so the practical effect is usually small.
How serious is the interaction between Dexamethasone-tobramycin and Erythromycin ethylsuccinate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine change is needed with topical or ophthalmic dexamethasone-tobramycin; if systemic exposure is substantial, watch for corticosteroid excess such as hyperglycemia and fluid retention.
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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