Cetirizine vs Osimertinib

## Cetirizine vs Osimertinib: Overview

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

## Mechanism of Action

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

**Osimertinib**: Third-generation irreversible EGFR TKI targeting T790M resistance mutation and activating mutations.

## Pharmacokinetics

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

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Osimertinib — C28H33N7O2.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Osimertinib — 499.6050 g/mol.

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