Cimetidine vs Diphenhydramine

## Cimetidine vs Diphenhydramine: Overview

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

## Mechanism of Action

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

## Pharmacokinetics

**Half-life**: Cimetidine — N/A; Diphenhydramine — 2-8 hours.

## Chemical Properties

**Molecular Formula**: Cimetidine — N/A; Diphenhydramine — C17H21NO.

**Molecular Weight**: Cimetidine — N/A; Diphenhydramine — 255.3550 g/mol.

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