Cetirizine vs Citalopram

## Cetirizine vs Citalopram: Overview

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

## Mechanism of Action

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

**Citalopram**: Selective serotonin reuptake inhibitor (SSRI); racemic mixture with escitalopram as active S-enantiomer.

## Pharmacokinetics

**Half-life**: Cetirizine — 6.5-10 hours; Citalopram — 35 hours.

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Citalopram — C20H21FN2O.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Citalopram — 324.3920 g/mol.

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