Fildena 200mg should not be taken more than once per day, and it’s usually taken about 30 minutes to 1 hour before sexual activity. Sildenafil citrate helps to relax the muscles in the blood vessels of the penis, allowing for increased blood flow, which helps men with erectile dysfunction achieve and sustain an erection during sexual activity. These are additional ingredients that ensure the tablet maintains its proper form and is stable. Sildenafil works by inhi***ing the enzyme phosphodiesterase type 5 (PDE5). This leads to increased blood flow to the penis when sexually stimulated, helping men achieve and maintain an erection suitable for sexual activity.