Aspirin vs Diphenhydramine

## Aspirin vs Diphenhydramine: Overview

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

## Mechanism of Action

**Aspirin**: Irreversibly inhibits cyclooxygenase-1 and -2.

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

## Pharmacokinetics

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

## Chemical Properties

**Molecular Formula**: Aspirin — C9H8O4; Diphenhydramine — C17H21NO.

**Molecular Weight**: Aspirin — 180.1580 g/mol; Diphenhydramine — 255.3550 g/mol.

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