Erlotinib vs Phenytoin

## Erlotinib vs Phenytoin: Overview

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

## Mechanism of Action

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

**Phenytoin**: Sodium channel blocker stabilizing inactive state.

## Pharmacokinetics

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

## Chemical Properties

**Molecular Formula**: Erlotinib — C22H23N3O4; Phenytoin — C15H12N2O2.

**Molecular Weight**: Erlotinib — 393.4380 g/mol; Phenytoin — 252.2680 g/mol.

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