Fentanyl vs Gefitinib

## Fentanyl vs Gefitinib: Overview

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

## Mechanism of Action

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

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

## Pharmacokinetics

**Half-life**: Fentanyl — 2-4 hours; Gefitinib — 48 hours.

## Chemical Properties

**Molecular Formula**: Fentanyl — C22H28N2O; Gefitinib — C22H24ClFN4O3.

**Molecular Weight**: Fentanyl — 336.4700 g/mol; Gefitinib — 446.9000 g/mol.

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