Afatinib vs Diphenhydramine

## Afatinib vs Diphenhydramine: Overview

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

## Mechanism of Action

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

**Diphenhydramine**: First-generation H1 antihistamine with anticholinergic properties.

## Pharmacokinetics

**Half-life**: Afatinib — 37 hours; Diphenhydramine — 2-8 hours.

## Chemical Properties

**Molecular Formula**: Afatinib — C24H25ClFN5O3; Diphenhydramine — C17H21NO.

**Molecular Weight**: Afatinib — 485.9400 g/mol; Diphenhydramine — 255.3550 g/mol.

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