Erlotinib vs Rituximab

## Erlotinib vs Rituximab: Overview

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

## Mechanism of Action

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

**Rituximab**: Chimeric anti-CD20 IgG1 monoclonal antibody inducing B-cell depletion via CDC, ADCC, and apoptosis.

## Pharmacokinetics

**Half-life**: Erlotinib — 36 hours; Rituximab — 22 days.

## Chemical Properties

**Molecular Formula**: Erlotinib — C22H23N3O4; Rituximab — N/A.

**Molecular Weight**: Erlotinib — 393.4380 g/mol; Rituximab — N/A.

**Type**: Erlotinib — Small molecule; Rituximab — Antibody.