Erlotinib vs Ondansetron

## Erlotinib vs Ondansetron: Overview

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

## Mechanism of Action

**Erlotinib**: Reversible inhibitor of EGFR (HER1) tyrosine kinase, blocking autophosphorylation.

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

## Pharmacokinetics

**Half-life**: Erlotinib — 36 hours; Ondansetron — 3-5 hours.

## Chemical Properties

**Molecular Formula**: Erlotinib — C22H23N3O4; Ondansetron — C18H19N3O.

**Molecular Weight**: Erlotinib — 393.4380 g/mol; Ondansetron — 293.3660 g/mol.

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