All guys over the age of 18 are safe to use Fildena 150 mg, which is most effective when taken 30 to 60 minutes before sex. If you are taking other medications or have a cardiac disease, it is essential that you speak with a healthcare professional. For up to 90 minutes, Fildena 150 mg can aid with erection maintenance. Sildenafil Citrate 100 mg is the active ingredient of the generic drug Fildena 150.