Raman spectra showing some of the species present within a suspected counterfeit erectile dysfunction tablet. (jpg)

Raman spectra showing some of the species present within a suspected counterfeit erectile dysfunction tablet. Sildenafil citrate and microcrystalline cellulose are present, as within the authentic tablet. An unknown, identified as calcium sulfate using Empty Modelling™ and the Renishaw Inorganic Material and Minerals Database, is not present in the authentic tablet and provides evidence it is counterfeit.