Cetirizine vs Gefitinib

## Cetirizine vs Gefitinib: Overview

This comparison examines the pharmacological differences between **Cetirizine** and **Gefitinib**.

## Mechanism of Action

**Cetirizine**: Second-generation H1 antihistamine.

**Gefitinib**: Selective reversible inhibitor of EGFR tyrosine kinase.

## Pharmacokinetics

**Half-life**: Cetirizine — 6.5-10 hours; Gefitinib — 48 hours.

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Gefitinib — C22H24ClFN4O3.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Gefitinib — 446.9000 g/mol.

**Type**: Cetirizine — Small molecule; Gefitinib — Small molecule.