Nitrofurantoin and Probenecid: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Nitrofurantoin interacts with Probenecid

Probenecid blocks renal tubular secretion of nitrofurantoin, reducing urinary concentrations below therapeutic levels while raising systemic exposure and toxicity risk.

What you should do

Avoid the combination — nitrofurantoin will lose efficacy as a urinary antiseptic; choose an alternative antibiotic guided by sensitivities.

Key facts

Severity

Moderate — caution required

Mechanism

Probenecid blocks renal tubular secretion of nitrofurantoin, reducing urinary concentrations below therapeutic levels wh...

Action

Avoid the combination — nitrofurantoin will lose efficacy as a urinary antiseptic; choose an alternative antibiotic guid...

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 Nitrofurantoin and Probenecid together?

With caution. Avoid the combination — nitrofurantoin will lose efficacy as a urinary antiseptic; choose an alternative antibiotic guided by sensitivities.

What is the severity of this interaction?

The interaction between Nitrofurantoin and Probenecid is classified as Moderate — caution required. Probenecid blocks renal tubular secretion of nitrofurantoin, reducing urinary concentrations below therapeutic levels while raising systemic exposure and toxicity risk.

What should I do if I'm prescribed both?

Avoid the combination — nitrofurantoin will lose efficacy as a urinary antiseptic; choose an alternative antibiotic guided by sensitivities. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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