Erlotinib vs Upadacitinib

## Erlotinib vs Upadacitinib: Overview

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

## Mechanism of Action

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

**Upadacitinib**: Selective JAK1 inhibitor reducing signaling from cytokines implicated in autoimmune diseases.

## Pharmacokinetics

**Half-life**: Erlotinib — 36 hours; Upadacitinib — 9-14 hours.

## Chemical Properties

**Molecular Formula**: Erlotinib — C22H23N3O4; Upadacitinib — C17H19F3N6O.

**Molecular Weight**: Erlotinib — 393.4380 g/mol; Upadacitinib — 380.3700 g/mol.

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