Buy Fildena 100 mg online in usa and treat Male impotence. The way that fildena works is by impeding the body's phosphodiesterase enzyme. Sildenafil Fildena purple pill works by promoting blood flow. PDE 5 inhibitors were initially studied for their potential to treat hypertension and angina, but researchers unintentionally found that they could also help men with erectile dysfunction. You can have it either before or after food. You must take this medication exactly as your doctor has instructed. Take it an hour or so before engaging in sexual activities. Despite the fact that each person's working time is different, it typically lasts between 30 and an hour.