Ondansetron vs Tofacitinib

## Ondansetron vs Tofacitinib: Overview

This comparison examines the pharmacological differences between **Ondansetron** and **Tofacitinib**.

## Mechanism of Action

**Ondansetron**: Selective 5-HT3 receptor antagonist.

**Tofacitinib**: Pan-JAK inhibitor with preference for JAK1 and JAK3 blocking pro-inflammatory cytokine signaling.

## Pharmacokinetics

**Half-life**: Ondansetron — 3-5 hours; Tofacitinib — 3.2 hours.

## Chemical Properties

**Molecular Formula**: Ondansetron — C18H19N3O; Tofacitinib — C16H20N6O.

**Molecular Weight**: Ondansetron — 293.3660 g/mol; Tofacitinib — 312.3700 g/mol.

**Type**: Ondansetron — Small molecule; Tofacitinib — Small molecule.