Diphenhydramine vs Metronidazole

## Diphenhydramine vs Metronidazole: Overview

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

## Mechanism of Action

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

**Metronidazole**: Forms cytotoxic free radicals that damage bacterial DNA.

## Pharmacokinetics

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

## Chemical Properties

**Molecular Formula**: Diphenhydramine — C17H21NO; Metronidazole — C6H9N3O3.

**Molecular Weight**: Diphenhydramine — 255.3550 g/mol; Metronidazole — 171.1540 g/mol.

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