Tests of unregulated "online Viagra" have found harmful contaminants such as blue printer ink, toxic paint, lead, and plaster.
Sildenafil can cause a lethal drop in blood pressure if taken with nitrates (common heart medications). A doctor's screening is essential to avoid this.
Some pills purchased without a prescription contain inconsistent amounts, while others may cause priapism (a painful erection lasting 4+ hours that causes permanent damage).
Sildenafil, the active ingredient in Viagra , is classified as a prescription-only medication by the FDA in the U.S..
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