Diphenhydramine vs Metoprolol

## Diphenhydramine vs Metoprolol: Overview

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

## Mechanism of Action

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

**Metoprolol**: Selective beta-1 adrenergic receptor blocker.

## Pharmacokinetics

**Half-life**: Diphenhydramine — 2-8 hours; Metoprolol — 3-7 hours.

## Chemical Properties

**Molecular Formula**: Diphenhydramine — C17H21NO; Metoprolol — C15H25NO3.

**Molecular Weight**: Diphenhydramine — 255.3550 g/mol; Metoprolol — 267.3640 g/mol.

**Type**: Diphenhydramine — Small molecule; Metoprolol — Small molecule.