Anderson Silva Fails Second Drug Test From UFC 183, Is Suspended

January was a month of failed drug tests for former UFC middleweight champion Anderson Silva.

Silva failed a second drug test administered by the Nevada State Athletic Commission on Jan. 31, the night of his UFC 183 unanimous victory over Nick Diaz, NSAC executive director Bob Bennett confirmed to on Tuesday. The 39-year-old already had failed an out-of-competition drug test taken on Jan. 9, testing positive for the anabolic steroid Drostanolone.

Silva’s post-fight urine test on Jan. 31 showed he again tested positive for Drostanolone while also showing traces of anti-anxiety medications Oxazepam and Temazepam, which is used to treat insomnia, according to

In between the two failed tests, Silva provided a clean sample Jan. 19.

“I can’t speak for the (NSAC) Chairman nor can I speak for the commissioners,” Bennett told “But something I find particularly concerning is that he tested positive on Jan. 9 and then he tested negative on Jan. 19. If he took this orally, it only stays in your system five to seven days.

“So, obviously, he used it sometime around Jan. 9 and then he used it shortly before the night of the fight. Whether the commission finds this egregious — that he tested positive twice out of three times — is up to them. I certainly find it concerning and unacceptable. It gives an unfair advantage to the person on that. God forbid, a serious injury were to occur to an opponent when someone is on something.”

The NSAC since has temporarily suspended Silva.

Thumbnail photo via Jayne Kamin-Oncea/USA TODAY Sports Images

Thumbnail photo via Anderson Silva (red gloves) prepares to fight Nick Diaz (not pictured) in a middleweight bout during UFC 183 at the MGM Grand Garden Arena.

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