Cetirizine vs Phenytoin

## Cetirizine vs Phenytoin: Overview

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

## Mechanism of Action

**Cetirizine**: Second-generation H1 antihistamine.

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

## Pharmacokinetics

**Half-life**: Cetirizine — 6.5-10 hours; Phenytoin — 22 hours.

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Phenytoin — C15H12N2O2.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Phenytoin — 252.2680 g/mol.

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