Donepezil vs Sildenafil

## Donepezil vs Sildenafil: Overview

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

## Mechanism of Action

**Donepezil**: Reversible acetylcholinesterase inhibitor.

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

## Pharmacokinetics

**Half-life**: Donepezil — 70 hours; Sildenafil — 4 hours.

## Chemical Properties

**Molecular Formula**: Donepezil — C24H29NO3; Sildenafil — C22H30N6O4S.

**Molecular Weight**: Donepezil — 379.4920 g/mol; Sildenafil — 474.5800 g/mol.

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