As soon as the fildena 100 tablet enters the body the pill pumps blood into the penis so that they get enough power to enjoy sex. fildena 100 is a very popular and popular dose in Fildena tablets. The active ingredient in this drug is sildenafil citrate. Therefore the effect of this drug lasts for 4 to 6 hours. And if the effect of this medicine lasts for more than 6 hours, seek the help of a doctor immediately.