UFC Star Tommy McMillen Rushed to Hospital in Arizona ... Officers Administered Narcan

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Tommy McMillen -- the featherweight UFC fighter sporting a perfect 12-0 record -- was rushed to the hospital on Sunday after cops administered Narcan ... TMZ has learned.

A spokesperson for the Scottsdale Police Department tells TMZ ... McMillen was transported to a hospital after he was found unresponsive in Cake -- a nightclub in the city's Old Town district.

We're told responding officers removed him from the bathroom, then administered Narcan after they said they saw a white, powdery substance on the ground near him.