Drug interactions
Dexamethasone-tobramycin + Sildenafil
Severity: Minor
Dexamethasone-tobramycin and Sildenafil: 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
Dexamethasone may lower sildenafil concentrations through enzyme induction. This could reduce efficacy, although the effect is expected to be modest with short courses.
What this interaction means in plain words
Dexamethasone-tobramycin and Sildenafil 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; Sildenafil belongs to Genitourinary.
Why it happens
Dexamethasone induces CYP3A4, increasing sildenafil metabolism.
What to do
Monitor response to sildenafil and adjust the dose if efficacy is reduced during prolonged dexamethasone therapy.
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 Sildenafil
- Amyl nitrite + Sildenafil Contraindicated
- Atazanavir + Sildenafil Contraindicated
- Cobicistat + Sildenafil Contraindicated
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Sildenafil Contraindicated
- Glyceryl trinitrate pr + Sildenafil Contraindicated
- Isosorbide dinitrate + Sildenafil Contraindicated
Frequently asked questions
Can I take Dexamethasone-tobramycin with Sildenafil?
MediHelp rates the interaction as minor. Dexamethasone-tobramycin and Sildenafil 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 may lower sildenafil concentrations through enzyme induction. This could reduce efficacy, although the effect is expected to be modest with short courses.
How serious is the interaction between Dexamethasone-tobramycin and Sildenafil?
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 response to sildenafil and adjust the dose if efficacy is reduced during prolonged dexamethasone therapy.
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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