Ondansetron vs Sildenafil

## Ondansetron vs Sildenafil: Overview

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

## Mechanism of Action

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

**Sildenafil**: Selective PDE5 inhibitor increasing cGMP.

## Pharmacokinetics

**Half-life**: Ondansetron — 3-5 hours; Sildenafil — 4 hours.

## Chemical Properties

**Molecular Formula**: Ondansetron — C18H19N3O; Sildenafil — C22H30N6O4S.

**Molecular Weight**: Ondansetron — 293.3660 g/mol; Sildenafil — 474.5800 g/mol.

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