Erlotinib vs Imatinib

## Erlotinib vs Imatinib: Overview

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

## Mechanism of Action

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

**Imatinib**: Selective inhibitor of BCR-ABL, c-Kit, and PDGFR tyrosine kinases.

## Pharmacokinetics

**Half-life**: Erlotinib — 36 hours; Imatinib — 18 hours.

## Chemical Properties

**Molecular Formula**: Erlotinib — C22H23N3O4; Imatinib — C29H31N7O.

**Molecular Weight**: Erlotinib — 393.4380 g/mol; Imatinib — 493.6030 g/mol.

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