Cetirizine vs Ondansetron

## Cetirizine vs Ondansetron: Overview

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

## Mechanism of Action

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

**Ondansetron**: Selective 5-HT3 receptor antagonist.

## Pharmacokinetics

**Half-life**: Cetirizine — 6.5-10 hours; Ondansetron — 3-5 hours.

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Ondansetron — C18H19N3O.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Ondansetron — 293.3660 g/mol.

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