Target intelligence / Profile preview

Methotrexate Cmax

01

Overview

The term "Methotrexate Cmax" refers specifically to the maximum observed plasma concentration of the drug methotrexate following administration. This value is used in clinical pharmacology studies to compare different formulations or routes of administration—such as subcutaneous versus intramuscular injection—and assess bioequivalence between products. It reflects how much of the drug reaches systemic circulation at its peak but does not represent any molecular target or biological structure. Therefore, it should not be listed among molecular targets like enzymes or receptors.

Other names
Methotrexate maximum plasma concentrationMTX Cmax
02

Mechanism of action

Not applicable for "Cmax". For reference: Methotrexate acts primarily by inhibiting dihydrofolate reductase and interfering with DNA synthesis.

03

Safety considerations

High methotrexate plasma concentrations (high Cmax) are associated with increased risk of toxicity including myelosuppression, mucositis, liver dysfunction, nephrotoxicity.Monitoring of plasma levels may be required during high-dose therapy to guide leucovorin rescue and prevent adverse effects.
04

Interacting drugs

Mercaptopurine

1 more in the full profile.

05

Biomarkers

Plasma methotrexate concentration itself can be used for therapeutic drug monitoring to avoid toxicity.No specific biomarker for “Cmax” as an entity.

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