Fentanyl vs Tamoxifen

## Fentanyl vs Tamoxifen: Overview

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

## Mechanism of Action

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

**Tamoxifen**: Selective estrogen receptor modulator (SERM).

## Pharmacokinetics

**Half-life**: Fentanyl — 2-4 hours; Tamoxifen — 5-7 days.

## Chemical Properties

**Molecular Formula**: Fentanyl — C22H28N2O; Tamoxifen — C26H29NO.

**Molecular Weight**: Fentanyl — 336.4700 g/mol; Tamoxifen — 371.5150 g/mol.

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