Sildenafil acts as the active ingredient in Fildena 100 purple pill. These tablets are to be taken 30 minutes before sex. If you want to see the effects of Fildena 100mg quickly, take it on an empty stomach as a fatty meal reduces the effectiveness of the drug. Do not drink alcoholic beverages after taking Fildena 100 Mg. Do not use this drug more than once a day. Use this drug only when you really want sex.