Atezolizumab vs Cetirizine

## Atezolizumab vs Cetirizine: Overview

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

## Mechanism of Action

**Atezolizumab**: Fully human anti-PD-L1 IgG1 monoclonal antibody blocking PD-L1 interaction with PD-1 and B7.1.

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

## Pharmacokinetics

**Half-life**: Atezolizumab — 27 days; Cetirizine — 6.5-10 hours.

## Chemical Properties

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

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

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