Atenolol vs Diphenhydramine

## Atenolol vs Diphenhydramine: Overview

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

## Mechanism of Action

**Atenolol**: Cardioselective beta-1 adrenergic receptor blocker without intrinsic sympathomimetic activity.

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

## Pharmacokinetics

**Half-life**: Atenolol — 6-7 hours; Diphenhydramine — 2-8 hours.

## Chemical Properties

**Molecular Formula**: Atenolol — C14H22N2O3; Diphenhydramine — C17H21NO.

**Molecular Weight**: Atenolol — 266.3360 g/mol; Diphenhydramine — 255.3550 g/mol.

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