Fentanyl vs Phentermine

## Fentanyl vs Phentermine: Overview

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

## Mechanism of Action

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

## Pharmacokinetics

**Half-life**: Fentanyl — 2-4 hours; Phentermine — N/A.

## Chemical Properties

**Molecular Formula**: Fentanyl — C22H28N2O; Phentermine — N/A.

**Molecular Weight**: Fentanyl — 336.4700 g/mol; Phentermine — N/A.

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