tablet should know is who should take it. Anyone over 18 years of age can take these pills. If you are above 65 years, then it is good to get in touch with your doctor before you take them. It is not safe for men above 65 years of age if they are already having any other health issues Sildenafil Citrate is a significant active element in the drug, and it stimulates and maintains an erection during sexual activity. Fildena 50 has a lower dose than the other Fildena variants.This happens if the PDE-5 enzyme stops the blood flow. Once the effect of the PDE-5 enzyme is reduced, then the blood will start flowing to the penile area. As the pressure increases, men will be able to get an erection.