Enalapril and Trimethoprim: Drug Interaction Guide

Quick answer: This combination requires caution. Enalapril and Trimethoprim can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Enalapril interacts with Trimethoprim

Trimethoprim reduces renal potassium excretion through an amiloride-like effect on epithelial sodium channels. ACE inhibitors such as enalapril also reduce aldosterone-mediated potassium excretion.

What you should do

Monitor potassium and renal function, especially in older adults, chronic kidney disease, diabetes, or high-dose trimethoprim use.

Key facts

Severity

Moderate — caution required

Mechanism

Trimethoprim reduces renal potassium excretion through an amiloride-like effect on epithelial sodium channels. ACE inhib...

Action

Monitor potassium and renal function, especially in older adults, chronic kidney disease, diabetes, or high-dose trimeth...

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 Enalapril and Trimethoprim together?

With caution. Monitor potassium and renal function, especially in older adults, chronic kidney disease, diabetes, or high-dose trimethoprim use.

What is the severity of this interaction?

The interaction between Enalapril and Trimethoprim is classified as Moderate — caution required. Trimethoprim reduces renal potassium excretion through an amiloride-like effect on epithelial sodium channels. ACE inhibitors such as enalapril also reduce aldosterone-mediated potassium excretion.

What should I do if I'm prescribed both?

Monitor potassium and renal function, especially in older adults, chronic kidney disease, diabetes, or high-dose trimethoprim use. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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