Diphenhydramine vs Nivolumab

## Diphenhydramine vs Nivolumab: Overview

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

## Mechanism of Action

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

**Nivolumab**: Fully human anti-PD-1 IgG4 monoclonal antibody restoring T-cell anti-tumor activity.

## Pharmacokinetics

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

## Chemical Properties

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

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

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