Allopurinol vs Gefitinib

## Allopurinol vs Gefitinib: Overview

This comparison examines the pharmacological differences between **Allopurinol** and **Gefitinib**.

## Mechanism of Action

**Allopurinol**: Xanthine oxidase inhibitor reducing uric acid production.

**Gefitinib**: Selective reversible inhibitor of EGFR tyrosine kinase.

## Pharmacokinetics

**Half-life**: Allopurinol — 1-2 hours; Gefitinib — 48 hours.

## Chemical Properties

**Molecular Formula**: Allopurinol — C5H4N4O; Gefitinib — C22H24ClFN4O3.

**Molecular Weight**: Allopurinol — 136.1120 g/mol; Gefitinib — 446.9000 g/mol.

**Type**: Allopurinol — Small molecule; Gefitinib — Small molecule.