Afatinib vs Methotrexate

## Afatinib vs Methotrexate: Overview

This comparison examines the pharmacological differences between **Afatinib** and **Methotrexate**.

## Mechanism of Action

**Afatinib**: Irreversible covalent inhibitor of ErbB family (EGFR/HER1, HER2, HER4) tyrosine kinases.

**Methotrexate**: Dihydrofolate reductase inhibitor.

## Pharmacokinetics

**Half-life**: Afatinib — 37 hours; Methotrexate — 3-10 hours.

## Chemical Properties

**Molecular Formula**: Afatinib — C24H25ClFN5O3; Methotrexate — C20H22N8O5.

**Molecular Weight**: Afatinib — 485.9400 g/mol; Methotrexate — 454.4400 g/mol.

**Type**: Afatinib — Small molecule; Methotrexate — Small molecule.