Methotrexate vs Polymyxin B

## Methotrexate vs Polymyxin B: Overview

This comparison examines the pharmacological differences between **Methotrexate** and **Polymyxin B**.

## Mechanism of Action

**Methotrexate**: Dihydrofolate reductase inhibitor.

## Pharmacokinetics

**Half-life**: Methotrexate — 3-10 hours; Polymyxin B — N/A.

## Chemical Properties

**Molecular Formula**: Methotrexate — C20H22N8O5; Polymyxin B — N/A.

**Molecular Weight**: Methotrexate — 454.4400 g/mol; Polymyxin B — N/A.

**Type**: Methotrexate — Small molecule; Polymyxin B — Protein.