Atezolizumab vs Diphenhydramine

## Atezolizumab vs Diphenhydramine: Overview

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

## Mechanism of Action

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

**Diphenhydramine**: First-generation H1 antihistamine with anticholinergic properties.

## Pharmacokinetics

**Half-life**: Atezolizumab — 27 days; Diphenhydramine — 2-8 hours.

## Chemical Properties

**Molecular Formula**: Atezolizumab — N/A; Diphenhydramine — C17H21NO.

**Molecular Weight**: Atezolizumab — N/A; Diphenhydramine — 255.3550 g/mol.

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