Diphenhydramine vs Trastuzumab

## Diphenhydramine vs Trastuzumab: Overview

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

## Mechanism of Action

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

**Trastuzumab**: Anti-HER2 monoclonal antibody inhibiting receptor signaling.

## Pharmacokinetics

**Half-life**: Diphenhydramine — 2-8 hours; Trastuzumab — 28 days.

## Chemical Properties

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

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

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