The patient addressed both questions at the final visit for the last 4 weeks of the study. Follow your doctor’s orders or the directions on the label. There were highly statistically significant improvements on the two principal IIEF questions frequency of successful penetration during sexual activity and maintenance of erections after penetration on VIAGRA compared to placebo. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. Never take an extra dose to make up for a forgotten one. Children—Use is not recommended.What is sildenafil? Sildenafil is a prescription drug. It comes in the form of a tablet and suspension (liquid). Both are taken by mouth. It also comes in an intravenous . 1 day ago · A video call is not required for a prescription (unless your state requires it), which can help remove any anxiety you may have about talking with a doctor directly about your ED symptoms. Viagra. Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a tablet you’ll take by swallowing. It’s usually taken as needed about 1 hour.