Cetirizine vs Rituximab

## Cetirizine vs Rituximab: Overview

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

## Mechanism of Action

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

**Rituximab**: Chimeric anti-CD20 IgG1 monoclonal antibody inducing B-cell depletion via CDC, ADCC, and apoptosis.

## Pharmacokinetics

**Half-life**: Cetirizine — 6.5-10 hours; Rituximab — 22 days.

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Rituximab — N/A.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Rituximab — N/A.

**Type**: Cetirizine — Small molecule; Rituximab — Antibody.