Erlotinib vs Pembrolizumab

## Erlotinib vs Pembrolizumab: Overview

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

## Mechanism of Action

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

**Pembrolizumab**: Anti-PD-1 monoclonal antibody restoring anti-tumor immunity.

## Pharmacokinetics

**Half-life**: Erlotinib — 36 hours; Pembrolizumab — 26 days.

## Chemical Properties

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

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

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