Allopurinol vs Fentanyl

## Allopurinol vs Fentanyl: Overview

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

## Mechanism of Action

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

**Fentanyl**: Highly potent synthetic mu-opioid receptor agonist approximately 100 times more potent than morphine.

## Pharmacokinetics

**Half-life**: Allopurinol — 1-2 hours; Fentanyl — 2-4 hours.

## Chemical Properties

**Molecular Formula**: Allopurinol — C5H4N4O; Fentanyl — C22H28N2O.

**Molecular Weight**: Allopurinol — 136.1120 g/mol; Fentanyl — 336.4700 g/mol.

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