Sildenafil vs Tolcapone

## Sildenafil vs Tolcapone: Overview

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

## Mechanism of Action

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

## Pharmacokinetics

**Half-life**: Sildenafil — 4 hours; Tolcapone — N/A.

## Chemical Properties

**Molecular Formula**: Sildenafil — C22H30N6O4S; Tolcapone — N/A.

**Molecular Weight**: Sildenafil — 474.5800 g/mol; Tolcapone — N/A.

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