**Chromatographic Separation and Identification of Sildenafil and Yohimbine Analogues Illegally Added in Herbal Supplements**

Hakan Göker*\*,* Maksut Coşkun and Gülgün Ayhan-Klcgil *Central Instrumental Analysis II Laboratory, Faculty of Pharmacy, Ankara University, Tandogan, Ankara, Turkey* 
