Entwistle was pulled from his bout with Rob Font following the trip to the hospital as UFC officials later confirmed and the fighter explained what happened in an Instagram post on Friday.
"Had some problems with my weight very early in to the weight cut. I slipped in and out of consciousness during the bath, was took to hospital, administrated IV and some other drugs," Entwistle said. "The UFC staff was great all the way through they came to the hospital, I said I could still fight and asked if we could do a same day weigh-in and (Rob Font) took a big percentage of my purse.
"It seemed positive at the time. The UFC spoke to the doctors and they went to consult with there own doctors. I got a phone call from Joe Silva this morning explaining he couldn't let me fight due to the problem with my kidneys which I have to accept. I would like to apologize to the UFC and Rob Font and everyone that was looking forward to seeing the fight."
Entwistle also stated after this latest experience weight cutting that he questions if he will ever put his body through that again before deciding to fight again.
Font will serve as a backup for the event just in case another bantamweight fighter is unable to compete on Saturday night.