Filitra 20 mg is available through various online pharmacies. Ensure you purchase from reputable sources to avoid counterfeit products. Always consult with a healthcare provider before starting any new medication to ensure it's appropriate for your health condition. Vardenafil, the active ingredient in Filitra 20 mg, works by inhibiting the PDE5 enzyme, which regulates blood flow in the penis. By blocking this enzyme, vardenafil allows for increased blood flow during sexual arousal, helping men achieve and maintain an erection.