Methotrexate and Penicillin V: Drug Interaction Guide

Quick answer: This combination requires caution. Methotrexate and Penicillin V can be used together with adjustments and monitoring.

Interaction severity: Moderate — caution required

How Methotrexate interacts with Penicillin V

Penicillins can reduce renal tubular secretion of methotrexate, increasing methotrexate concentrations. Toxicity risk is higher with renal impairment or high-dose methotrexate.

What you should do

Use with caution and monitor for mouth ulcers, bruising, infection, and renal dysfunction. Consider alternative antibiotics in higher-risk patients.

Key facts

Severity

Moderate — caution required

Mechanism

Penicillins can reduce renal tubular secretion of methotrexate, increasing methotrexate concentrations. Toxicity risk is...

Action

Use with caution and monitor for mouth ulcers, bruising, infection, and renal dysfunction. Consider alternative antibiot...

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 Methotrexate and Penicillin V together?

With caution. Use with caution and monitor for mouth ulcers, bruising, infection, and renal dysfunction. Consider alternative antibiotics in higher-risk patients.

What is the severity of this interaction?

The interaction between Methotrexate and Penicillin V is classified as Moderate — caution required. Penicillins can reduce renal tubular secretion of methotrexate, increasing methotrexate concentrations. Toxicity risk is higher with renal impairment or high-dose methotrexate.

What should I do if I'm prescribed both?

Use with caution and monitor for mouth ulcers, bruising, infection, and renal dysfunction. Consider alternative antibiotics in higher-risk patients. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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