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. 2010 Aug 13;5(8):e12199. doi: 10.1371/journal.pone.0012199

Figure 1. Viagra® and its copies by price in US$ (including 14 samples of suspected Viagra® whose identity could not be confirmed).

Figure 1

“Copy Viagra with API” refers to samples which are copies of Viagra® (it was not established whether they were bioequivalent copies - generics) and, from spectrographic analysis, which contain the correct active pharmaceutical ingredient (API) – sildenafil citrate. “Copy Viagra with Zero API” refers to samples which are copies of Viagra® that do not contain any sildenafil citrate.