Anderson Silva blamed a tainted sexual enhancement drug a friend gave him for a positive test for the steroid drostanolone earlier this year when he fought Nick Diaz, and Michael Bisping already fired his first shots leading up to their middleweight clash in London.
Silva and Bisping will headline a UFC Fight Night card on Feb. 27, and Bisping asked the Brazilian to "leave the viagra out of it" for their bout. "The Spider", who also failed a test for oxazepam and temazepam, responded to Bisping’s verbal jabs during a conference call Tuesday.