On 26 July 2008, Silva won the EliteXC Heavyweight Championship, with a second-round TKO win over UFC veteran Justin Eilers. Silva later tested positive for the anabolic steroid Boldenone, and was suspended for one year and fined $2,500 by the California State Athletic Commission. According to Silva's manager, Alex Davis, the positive test was caused by Silva's use of Novedex, a testosterone-booster he takes to raise his low testosterone levels (a symptom of his acromegaly). "He has to treat it", said Davis. "He spends between $6,000 and $8,000 a month just on medicine for it. He needs to be able to keep fighting to make a living. If it's between Antônio's health and pleasing the athletic commission, we have to choose his health."