Ondansetron vs Trimethoprim

## Ondansetron vs Trimethoprim: Overview

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

## Mechanism of Action

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

**Trimethoprim**: Dihydrofolate reductase inhibitor (bacterial selective).

## Pharmacokinetics

**Half-life**: Ondansetron — 3-5 hours; Trimethoprim — 8-10 hours.

## Chemical Properties

**Molecular Formula**: Ondansetron — C18H19N3O; Trimethoprim — C14H18N4O3.

**Molecular Weight**: Ondansetron — 293.3660 g/mol; Trimethoprim — 290.3180 g/mol.

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