Diphenhydramine vs Topiramate

## Diphenhydramine vs Topiramate: Overview

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

## Mechanism of Action

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

**Topiramate**: Multiple mechanisms: Na+ channel block, GABA enhancement, glutamate inhibition.

## Pharmacokinetics

**Half-life**: Diphenhydramine — 2-8 hours; Topiramate — 21 hours.

## Chemical Properties

**Molecular Formula**: Diphenhydramine — C17H21NO; Topiramate — C12H21NO8S.

**Molecular Weight**: Diphenhydramine — 255.3550 g/mol; Topiramate — 339.3630 g/mol.

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