Afatinib vs Sildenafil

## Afatinib vs Sildenafil: Overview

This comparison examines the pharmacological differences between **Afatinib** and **Sildenafil**.

## Mechanism of Action

**Afatinib**: Irreversible covalent inhibitor of ErbB family (EGFR/HER1, HER2, HER4) tyrosine kinases.

**Sildenafil**: Selective PDE5 inhibitor increasing cGMP.

## Pharmacokinetics

**Half-life**: Afatinib — 37 hours; Sildenafil — 4 hours.

## Chemical Properties

**Molecular Formula**: Afatinib — C24H25ClFN5O3; Sildenafil — C22H30N6O4S.

**Molecular Weight**: Afatinib — 485.9400 g/mol; Sildenafil — 474.5800 g/mol.

**Type**: Afatinib — Small molecule; Sildenafil — Small molecule.