Family members of Whitney tell us the singer had a prescription for the drug, which is commonly used to treat anxiety and depression.
We told you yesterday ... the night before Whitney died, she had been drinking a lot. Xanax mixed with alcohol can cause severe sedation, which could cause someone to fall asleep in a bathtub.
As TMZ first reported, Whitney was found in the bathtub and removed before EMTs arrived. The L.A. County Coroner will perform an autopsy -- possibly today -- to determine if Whitney died from drowning, and OD or other causes.
As we previously reported, Beverly Hills cops obtained a search warrant and found various prescription bottles -- but, as far as we know, no illicit drugs.
No illegal drugs have been found in the hotel room where Whitney Houston died -- at least not yet -- but prescription drugs were present, and it's possible the singer drowned in the bathtub ... TMZ has learned.
Sources tell us ... when EMTs arrived Whitney's body was already removed from the bathtub so it will take an autopsy to determine if she OD'd, drowned or died from some other cause.
Informed sources tell us ... Beverly Hills cops -- who were still searching the room at the time this story was posted -- found various pill bottles. There was no evidence that Whitney was drinking alcohol in the room.
Whitney's body was just removed from the room on a gurney. It will go to the morgue for an autopsy to determine cause of death.
Meanwhile, Whitney Houston's daughter Bobbi Kristina got into an angry shouting match with police officers outside the hotel room where her mother was found dead .
According to law enforcement sources ... Bobbi Kristina showed up on the 4th floor of the Beverly Hilton several hours after Whitney's death. We're told when officers informed her no one was allowed to see the body -- BK screamed, cursed and demanded to see her mother.
Ultimately, she was not allowed into the room and left. We're told Whitney's cousin Dionne Warwick also showed up later. She too was turned away by officers.
As we reported earlier ... other family members and friends -- who were in the room when authorities arrived -- identified Whitney's body.
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