Drug interactions
Bumetanide + Ofloxacin
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.
Overview
Bumetanide can cause hypokalemia/hypomagnesemia, which may potentiate the QTc-prolonging effect of ofloxacin and increase the risk of torsades de pointes or other ventricular arrhythmias.
Mechanism of action
Pharmacodynamic: electrolyte depletion (K+, Mg2+) from bumetanide predisposes to QT prolongation; ofloxacin has QT-prolonging potential. No significant pharmacokinetic interaction known.
Clinical management
Correct and maintain electrolytes (target K > 4 mEq/L, Mg > 2 mg/dL) before/during coadministration; obtain a baseline ECG and repeat if additional risk factors (elderly, structural heart disease, bradycardia, high doses, renal impairment) or symptoms arise; avoid other QT-prolonging agents when possible; consider a non–QT-prolonging antibiotic if significant baseline QT risk or refractory hypokalemia.
Drug reference
References
- QTDrugs Lists: Ofloxacin — Conditional Risk of Torsades de Pointes — CredibleMeds
- Acquired long QT syndrome: Definitions, pathophysiology, and causes — UpToDate
- Drug-induced prolongation of the QT interval (Roden DM, N Engl J Med 2004) — PubMed
Frequently asked questions
Can I take Bumetanide with Ofloxacin?
The interaction is rated: Moderate. Bumetanide can cause hypokalemia/hypomagnesemia, which may potentiate the QTc-prolonging effect of ofloxacin and increase the risk of torsades de pointes or other ventricular arrhythmias.
How serious is the interaction between Bumetanide and Ofloxacin?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between Bumetanide and Ofloxacin managed?
Correct and maintain electrolytes (target K > 4 mEq/L, Mg > 2 mg/dL) before/during coadministration; obtain a baseline ECG and repeat if additional risk factors (elderly, structural heart disease, bradycardia, high doses, renal impairment) or symptoms arise; avoid other QT-prolonging agents when possible; consider a non–QT-prolonging antibiotic if significant baseline QT risk or refractory hypokalemia.
Why do Bumetanide and Ofloxacin interact?
Pharmacodynamic: electrolyte depletion (K+, Mg2+) from bumetanide predisposes to QT prolongation; ofloxacin has QT-prolonging potential. No significant pharmacokinetic interaction known.
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