FDA notified consumers that lab analysis of lots of ejaculoid XXTREME and stimuloid II found that the products, sold as dietary supplements, contain sulfoaildenafil, similar to sildenafil, which is an active ingredient of an FDA-approved drug for male erectile dysfunction, making these products unapproved drugs. – FDA Medatch (emphasis added)
The drug has documented side effects from clinical trials and post-approval monitoring that is standard for pharmaceuticals. It also is not appropriate for people with certain other conditions, like high blood pressure, or in combination with other drugs, like nitroglycerin. These negative effects cannot be avoided if one does not know that this drug is in the supplement, especially considering that individuals for whom sildenafil (and analogs) is not a safe treatment are likely customers for these types of supplement.
Remember real drugs, with real physiological activities, have very real side effects. As a result, some drugs cannot be safely taken by individuals with certain underlying conditions or who are already taking other medications that are not compatible. Not only can these side effects and interactions not be avoided if they are undeclared, but the individuals that cannot take the drug due to underlying risk factors are likely customers for these types of supplement.
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The Finch and Pea 