For most men, side effects are minor especially when they take a dose like cenforce 100 mg. Some men however may experience serious side effects that require medical assistance. When looking at Cenforce 100 mg vs Viagra, the effects of both can generally be noticed for up to 4-6 hours after observing its initial effects. This will likely differ for some users who have metabolisms that are either faster, or slower than the average males. The user will likely notice weakened effects when going into the final hours of its onset time, however. This is why it is important to ingest the medication 45-60 minutes before intended sexual activities. This is recommended to make sure that there are no complications for the user relating to this sustained erection. It is importance that patients listen to the advice received from their doctor regarding these scenarios; users could be told to try an ED medication utilizing a different active ingredient, or directed off of PDE-5 inhibitors altogether. Whatever is recommended by a patient’s doctor is the recommended approach.