High performance liquid chromatography-diode array and electrospray-mass spectrometry analysis of vardenafil, sildenafil, tadalafil, testosterone and local anesthetics in cosmetic creams sold on the Internet web sites.
De Orsi D, Pellegrini M, Marchei E, Nebuloni P, Gallinella B, Scaravelli G, Martufi A, Gagliardi L, Pichini S. J Pharm Biomed Anal. 2009 Oct 15; 50(3):362-9. Epub 2009 May 30.