There are several ED drugs on the market to treat the problem of ED; one such drug that has been shown to be effective in treating ED is Fildena 100 Mg pills. If you're taking sildenafil for prostate enlargement, you can take it in the morning or the evening, but it's best to take it at the same time every day. Men's erectile dysfunction used to be a serious problem. There are no ED drugs on the market to deal with this problem.