Methotrexate and Penicillins: Drug Interaction Guide

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

Interaction severity: Moderate — caution required

How Methotrexate interacts with Penicillins

Penicillins may reduce renal tubular secretion of methotrexate through competition at organic anion transport pathways. This can increase methotrexate concentrations and toxicity.

What you should do

Use with caution, especially at high methotrexate doses; monitor for mucositis, cytopenias, and renal dysfunction.

Key facts

Severity

Moderate — caution required

Mechanism

Penicillins may reduce renal tubular secretion of methotrexate through competition at organic anion transport pathways. ...

Action

Use with caution, especially at high methotrexate doses; monitor for mucositis, cytopenias, and renal dysfunction.

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 Penicillins together?

With caution. Use with caution, especially at high methotrexate doses; monitor for mucositis, cytopenias, and renal dysfunction.

What is the severity of this interaction?

The interaction between Methotrexate and Penicillins is classified as Moderate — caution required. Penicillins may reduce renal tubular secretion of methotrexate through competition at organic anion transport pathways. This can increase methotrexate concentrations and toxicity.

What should I do if I'm prescribed both?

Use with caution, especially at high methotrexate doses; monitor for mucositis, cytopenias, and renal dysfunction. Always consult your prescribing clinician — do not stop or change medications without medical guidance.

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