Acetaminophen vs Diphenhydramine

## Acetaminophen vs Diphenhydramine: Overview

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

## Mechanism of Action

**Acetaminophen**: Inhibits prostaglandin synthesis in the CNS and peripherally blocks pain impulse generation.

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

## Pharmacokinetics

**Half-life**: Acetaminophen — 1-4 hours; Diphenhydramine — 2-8 hours.

## Chemical Properties

**Molecular Formula**: Acetaminophen — C8H9NO2; Diphenhydramine — C17H21NO.

**Molecular Weight**: Acetaminophen — 151.1630 g/mol; Diphenhydramine — 255.3550 g/mol.

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