Aspirin vs Erlotinib

## Aspirin vs Erlotinib: Overview

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

## Mechanism of Action

**Aspirin**: Irreversibly inhibits cyclooxygenase-1 and -2.

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

## Pharmacokinetics

**Half-life**: Aspirin — 2-3 hours; Erlotinib — 36 hours.

## Chemical Properties

**Molecular Formula**: Aspirin — C9H8O4; Erlotinib — C22H23N3O4.

**Molecular Weight**: Aspirin — 180.1580 g/mol; Erlotinib — 393.4380 g/mol.

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