Cetirizine vs Fentanyl

## Cetirizine vs Fentanyl: Overview

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

## Mechanism of Action

**Cetirizine**: Second-generation H1 antihistamine.

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

## Pharmacokinetics

**Half-life**: Cetirizine — 6.5-10 hours; Fentanyl — 2-4 hours.

## Chemical Properties

**Molecular Formula**: Cetirizine — C21H25ClN2O3; Fentanyl — C22H28N2O.

**Molecular Weight**: Cetirizine — 388.8900 g/mol; Fentanyl — 336.4700 g/mol.

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