Viagra (sildenafil) is by far the most popular prescription medicine used to treat male impotence (or erectile dysfunction) in people of all ages, including those diagnosed with certain conditions that may be contraindications. Most people tolerate Viagra well and report only mild side effects – such as nasal congestion, headache, indigestion, trouble telling the difference between green and blue, dizziness, facial flushing, diarrhea, and unexplained rash. Unless these side effects persist or become bothersome you do not need to worry about them or report them to your health care provider. However, it’s important to be aware of any potentially serious side effects that may differ from person to person, and should therefore be reported to your health care provider.

Although Viagra is originally intended for men and should not be taken by women or children it has been classified as FDA pregnancy category B. This means Viagra is unlikely to be harmful to an unborn baby while it is not known whether it can pass into breast milk. If you are allergic to the active ingredient of this medicine do not take it as you are most likely to have the same reaction. If you have hives, rash, trouble breathing and swelling seek emergency medical help as these may be the signs of an allergic reaction.