Sotalol and Trimethoprim Sulfamethoxazole: Drug Interaction Guide

Quick answer: This is a major interaction — avoid combining Sotalol and Trimethoprim Sulfamethoxazole unless specifically directed by your doctor.

Interaction severity: Major — avoid combination

How Sotalol interacts with Trimethoprim Sulfamethoxazole

Sotalol prolongs cardiac repolarization by potassium channel blockade, and trimethoprim-sulfamethoxazole has been associated with QT prolongation in susceptible patients. Combined use can increase torsades de pointes risk, especially with renal impairment or electrolyte abnormalities.

What you should do

Avoid the combination in high-risk patients. If necessary, monitor ECG, renal function, potassium, and magnesium.

Key facts

Severity

Major — avoid combination

Mechanism

Sotalol prolongs cardiac repolarization by potassium channel blockade, and trimethoprim-sulfamethoxazole has been associ...

Action

Avoid the combination in high-risk patients. If necessary, monitor ECG, renal function, potassium, and magnesium.

Important medical disclaimer: This page provides educational information about drug interactions for general reference. It is not a substitute for professional medical advice, diagnosis, or treatment. Always discuss your specific medications with a qualified healthcare provider before starting, stopping, or changing any treatment. About our editorial team.

Frequently asked questions

Can I take Sotalol and Trimethoprim Sulfamethoxazole together?

No — this combination should generally be avoided. Avoid the combination in high-risk patients. If necessary, monitor ECG, renal function, potassium, and magnesium.

What is the severity of this interaction?

The interaction between Sotalol and Trimethoprim Sulfamethoxazole is classified as Major — avoid combination. Sotalol prolongs cardiac repolarization by potassium channel blockade, and trimethoprim-sulfamethoxazole has been associated with QT prolongation in susceptible patients. Combined use can increase torsades de pointes risk, especially with renal impairment or electrolyte abnormalities.

What should I do if I'm prescribed both?

Avoid the combination in high-risk patients. If necessary, monitor ECG, renal function, potassium, and magnesium. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

Last reviewed: by iMedic Medical Editorial Team. Our editorial process.