Cetirizine vs Ranitidine

## Cetirizine vs Ranitidine: Overview

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

## Mechanism of Action

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

**Ranitidine**: Competitive H2 receptor antagonist.

## Pharmacokinetics

**Half-life**: Cetirizine — 6.5-10 hours; Ranitidine — 2-3 hours.

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Ranitidine — C13H22N4O3S.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Ranitidine — 314.4050 g/mol.

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