Velsan XL: We’ve seen antibiotics.” Other tasty ingredients include rat poison and gypsum from wallboards. As for that signature blue colour — counterfeiters often get it from printer toner cartridges. Counterfeit versions of real drugs like Viagra are also a huge problem, as people try to save a few bucks by getting their medications from not so reputable sources. Pfizer, who makes the genuine blue pills, notes on its website that fake Viagra may contain amphetamines and other dangerous substances. Somewhere in there with Goat Weed and FDA labs detected aminotadalafil, an analogue of the active ingredient in the erectile dysfunction drug Cialis.