The dose of Fildena 100 that a man with impotence should take is one teaspoon per day. Most doctors recommend that a man with this condition start taking fildena 100 about two weeks before the first intercourse to minimize the risks of possible adverse effects on his system. If you are considering consuming fildena 100, be sure to speak with your doctor first, as there are certain instructions that must be followed when taking this herbal supplement. Some of the common instructions your doctor might give you include; how much fildena 100 to take, what are your tolerance levels and with what foods and drinks are you allowed to take fildena 100.