Stiff Nights Side Effects. What are the side effects of Stiff Nights, a Viagra alternative which is being marketed as an “all-natural” dietary supplement for sexual enhancement? Well, according to the U.S. Food and Drug Administration, Stiff Nights contains a chemical ingredient that can “dangerously lower blood pressure and is illegal”.
According to an FDA statement released today, Stiff Nights has sulfoaildenafil, a chemical which is similar to the ingredient in Viagra. If it interacts with prescription drugs known as nitrates, sulfoaildenafil can cause dangerously low blood pressure.
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