Drug interactions
Dexamethasone-tobramycin + Hydrochlorothiazide
Severity: Moderate
Dexamethasone-tobramycin and Hydrochlorothiazide: 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
Both corticosteroids and thiazide diuretics promote potassium loss. Together they can cause clinically relevant hypokalemia, which matters for patients with arrhythmia risk or on digoxin. Topical use has little effect, but systemic steroid exposure does.
What this interaction means in plain words
Dexamethasone-tobramycin and Hydrochlorothiazide 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.
Dexamethasone-tobramycin belongs to Anti Bacterial; Hydrochlorothiazide belongs to Cardiovascular.
Why it happens
Additive renal potassium wasting from mineralocorticoid activity and thiazide-induced distal sodium delivery.
What to do
Monitor serum potassium during systemic dexamethasone therapy and supplement potassium as needed.
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
Other interactions of Hydrochlorothiazide
Frequently asked questions
Can I take Dexamethasone-tobramycin with Hydrochlorothiazide?
MediHelp rates the interaction as moderate. Dexamethasone-tobramycin and Hydrochlorothiazide 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. Both corticosteroids and thiazide diuretics promote potassium loss. Together they can cause clinically relevant hypokalemia, which matters for patients with arrhythmia risk or on digoxin. Topical use has little effect, but systemic steroid exposure does.
How serious is the interaction between Dexamethasone-tobramycin and Hydrochlorothiazide?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor serum potassium during systemic dexamethasone therapy and supplement potassium as needed.
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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