Allopurinol vs Erlotinib

## Allopurinol vs Erlotinib: Overview

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

## Mechanism of Action

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

**Erlotinib**: Reversible inhibitor of EGFR (HER1) tyrosine kinase, blocking autophosphorylation.

## Pharmacokinetics

**Half-life**: Allopurinol — 1-2 hours; Erlotinib — 36 hours.

## Chemical Properties

**Molecular Formula**: Allopurinol — C5H4N4O; Erlotinib — C22H23N3O4.

**Molecular Weight**: Allopurinol — 136.1120 g/mol; Erlotinib — 393.4380 g/mol.

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