Diphenhydramine vs Propranolol

## Diphenhydramine vs Propranolol: Overview

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

## Mechanism of Action

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

**Propranolol**: Non-selective beta-adrenergic receptor blocker.

## Pharmacokinetics

**Half-life**: Diphenhydramine — 2-8 hours; Propranolol — 3-6 hours.

## Chemical Properties

**Molecular Formula**: Diphenhydramine — C17H21NO; Propranolol — C16H21NO2.

**Molecular Weight**: Diphenhydramine — 255.3550 g/mol; Propranolol — 259.3440 g/mol.

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