Side Effects of Sildenafil Citrate

Rare Side Effects

During clinical studies, there were a number of other side effects that occurred in less than 2 percent of people while they were taking sildenafil citrate. It is difficult to tell whether these side effects are caused by sildenafil citrate or something else.
Some of these possible side effects include but are not limited to:
In rare cases, there have also been serious problems that occur in the heart, brain, or blood vessels. These include:
In these cases, most of the people had cardiovascular (heart or blood vessel) risk factors. Also, these side effects occurred during or shortly after sexual activity. Therefore, it is difficult to tell whether the problems were related to sildenafil citrate, the person's existing risk factors, sexual activity, or a combination of these.
In people taking sildenafil citrate or other PDE5 inhibitors, there have also been rare cases of a condition called non-arteritic anterior ischemic optic neuropathy (NAION). This condition can lead to sudden loss of vision in one or both eyes (see Viagra and Blindness for more information).
There have been reports of transient global amnesia possibly due to sildenafil citrate. Transient global amnesia is a temporary loss of short-term memory. People may not remember recent events and have an impaired ability to form new memories. It usually lasts 24 hours or less and typically has no long-term consequences.
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