Drug interactions
Dexamethasone-tobramycin + Tolvaptan
Severity: Minor
Dexamethasone-tobramycin and Tolvaptan: 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
Systemic dexamethasone may lower tolvaptan exposure through CYP3A4 induction, reducing aquaretic effect. Topical use has negligible effect.
What this interaction means in plain words
Dexamethasone-tobramycin and Tolvaptan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Dexamethasone-tobramycin belongs to Anti Bacterial; Tolvaptan belongs to Endocrine.
Why it happens
Dexamethasone induces CYP3A4, increasing tolvaptan metabolism.
What to do
Monitor serum sodium and response if prolonged systemic dexamethasone is started; no action for topical use.
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
Other interactions of Tolvaptan
- Atazanavir + Tolvaptan Contraindicated
- Ceritinib + Tolvaptan Contraindicated
- Cobicistat + Tolvaptan Contraindicated
- Conivaptan + Tolvaptan Contraindicated
- Darunavir + Tolvaptan Contraindicated
- Idelalisib + Tolvaptan Contraindicated
Frequently asked questions
Can I take Dexamethasone-tobramycin with Tolvaptan?
MediHelp rates the interaction as minor. Dexamethasone-tobramycin and Tolvaptan have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Systemic dexamethasone may lower tolvaptan exposure through CYP3A4 induction, reducing aquaretic effect. Topical use has negligible effect.
How serious is the interaction between Dexamethasone-tobramycin and Tolvaptan?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum sodium and response if prolonged systemic dexamethasone is started; no action for topical use.
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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