Acetaminophen vs Cetirizine

## Acetaminophen vs Cetirizine: Overview

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

## Mechanism of Action

**Acetaminophen**: Inhibits prostaglandin synthesis in the CNS and peripherally blocks pain impulse generation.

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

## Pharmacokinetics

**Half-life**: Acetaminophen — 1-4 hours; Cetirizine — 6.5-10 hours.

## Chemical Properties

**Molecular Formula**: Acetaminophen — C8H9NO2; Cetirizine — C21H25ClN2O3.

**Molecular Weight**: Acetaminophen — 151.1630 g/mol; Cetirizine — 388.8900 g/mol.

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