Memantine vs Sildenafil

## Memantine vs Sildenafil: Overview

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

## Mechanism of Action

**Memantine**: Non-competitive NMDA receptor antagonist.

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

## Pharmacokinetics

**Half-life**: Memantine — 60-80 hours; Sildenafil — 4 hours.

## Chemical Properties

**Molecular Formula**: Memantine — C12H21N; Sildenafil — C22H30N6O4S.

**Molecular Weight**: Memantine — 179.3080 g/mol; Sildenafil — 474.5800 g/mol.

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