Cetirizine vs Doxycycline

## Cetirizine vs Doxycycline: Overview

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

## Mechanism of Action

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

**Doxycycline**: Inhibits bacterial protein synthesis by binding 30S ribosomal subunit.

## Pharmacokinetics

**Half-life**: Cetirizine — 6.5-10 hours; Doxycycline — 18-22 hours.

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Doxycycline — C22H24N2O8.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Doxycycline — 444.4350 g/mol.

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