Fildena 50 is considered an excellent drug for male impotence. Sildenafil citrate is its main ingredient which is very effective in curing impotence. It also facilitates blood flow to the penis. Take this pill 30-40 minutes before intercourse. But if you are currently suffering from any major illness, consult your doctor before taking the pill. If you miss a dose, take it as soon as you remember. But avoid taking 2 doses at the same time if you are very close to the next dose.