Doctor I have PE/ED, I want to know whether if it is good to take more than one tablet of Viagra (sildenafil) because one tablet seems not to have any effect on me?

Yes but. it depend what is the dose of the Viagra (sildenafil) you are taking it comes in 25,50,and 100 mg you should not exceed 100 mg second you are too young for this kind of a problem did you self diagnose yourself or that was actually a diagnosis was made by a urologist after a good evaluation if you have not seen a doctor for that see one i hope that answer your question good luck and thank you for using health T.