Phenytoin vs Topiramate

## Phenytoin vs Topiramate: Overview

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

## Mechanism of Action

**Phenytoin**: Sodium channel blocker stabilizing inactive state.

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

## Pharmacokinetics

**Half-life**: Phenytoin — 22 hours; Topiramate — 21 hours.

## Chemical Properties

**Molecular Formula**: Phenytoin — C15H12N2O2; Topiramate — C12H21NO8S.

**Molecular Weight**: Phenytoin — 252.2680 g/mol; Topiramate — 339.3630 g/mol.

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