Cetirizine vs Metronidazole

## Cetirizine vs Metronidazole: Overview

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

## Mechanism of Action

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

**Metronidazole**: Forms cytotoxic free radicals that damage bacterial DNA.

## Pharmacokinetics

**Half-life**: Cetirizine — 6.5-10 hours; Metronidazole — 8 hours.

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Metronidazole — C6H9N3O3.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Metronidazole — 171.1540 g/mol.

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