Drug interactions
Dexamethasone-tobramycin + Methyclothiazide
Severity: Minor
Dexamethasone-tobramycin and Methyclothiazide: 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
Corticosteroids and thiazide diuretics both promote potassium loss, so using them together can cause additive hypokalemia. Low potassium raises the risk of arrhythmias and muscle weakness. Topical dexamethasone-tobramycin produces little systemic effect.
What this interaction means in plain words
Dexamethasone-tobramycin and Methyclothiazide 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
Additive renal potassium wasting through mineralocorticoid activity of the corticosteroid and distal tubular sodium delivery from the thiazide.
What to do
Monitor serum potassium if systemic exposure to dexamethasone is significant, and supplement potassium if needed.
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 Methyclothiazide?
MediHelp rates the interaction as minor. Dexamethasone-tobramycin and Methyclothiazide have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Corticosteroids and thiazide diuretics both promote potassium loss, so using them together can cause additive hypokalemia. Low potassium raises the risk of arrhythmias and muscle weakness. Topical dexamethasone-tobramycin produces little systemic effect.
How serious is the interaction between Dexamethasone-tobramycin and Methyclothiazide?
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 potassium if systemic exposure to dexamethasone is significant, and supplement potassium if 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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