As with any medication, it's important to use Filitra 40 mg as directed by your healthcare provider and to follow their instructions for safe and effective use. Doubling the dosage without medical supervision can increase the risk of side effects and may not improve effectiveness.Filitra 40 mg is not suitable for everyone and may not be safe for individuals with certain medical conditions or those taking certain medications. It's essential to inform your healthcare provider about your medical history and all medications you are currently taking before starting vardenafil therapy.