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Benzamidenafil or xanthoanthrafil is a synthetic drug that acts as a PDE5 inhibitor. It has the same mechanism of action as pharmaceutical drugs used to treat erectile dysfunction,[1] but it is not approved by any regulatory agency for such use.
The drug has been found as an undeclared adulterant in supposedly "natural" health supplements.[1] In 2009, the supplement manufacturer Hi-Tech Pharmaceuticals recalled its product Stamina-Rx because it was adulterated with benzamidenafil.[2]
^ abZou, Peng; Hou, Peiling; Oh, Sharon Sze-Yin; Ge, Xiaowei; Bloodworth, Bosco Chen; Low, Min-Yong; Koh, Hwee-Ling (2008). "Identification of benzamidenafil, a new class of phosphodiesterase-5 inhibitor, as an adulterant in a dietary supplement". Journal of Pharmaceutical and Biomedical Analysis. 47 (2): 255–259. doi:10.1016/j.jpba.2008.01.004. PMID18280079.