TMZ reports that numerous medicine bottles were found in Houston's hotel room, with some dating back to last year, and some from the Mickey Fine pharmacy in Beverly Hills where Michael Jackson had numerous prescriptions filled for Demerol and other drugs.

Among the pills ... ibuprofen (painkiller), Xanax (anti-depressant), Midol (for menstrual cramps), amoxicillin (for treating bacterial infections) ... and more.

We're told the amoxicillin was prescribed recently because Whitney had been suffering from a sore throat.

We're told some of the pills were old ... some issued in 2011 ... but some of the bottles were from 2012. We're told the bottles that were recovered at the scene did not contain a lot of pills.

Sources tell us ... some of the prescriptions were filled at the infamous Mickey Fine pharmacy in Beverly Hills ... where Michael Jackson had numerous prescriptions filled for Demerol and other drugs.

Law enforcement sources tell us ... it's possible Whitney suffered a heart attack caused by an adverse reaction to her medication, but it is simply too early to make an official call on the cause of death.

15.46 Los Angeles Assistant Chief Coroner Ed Winter has said tests are still ongoing and there are unlikely to be any further updates for a 'couple' of days, but that the autopsy has been completed and the Houston family, who are currently planning the funeral, have the right to remove the body.

He confirmed that Houston was seen approximately one hour before she was found dead and ruled out foul play. He refused, however, to comment on the cause of death or the presence of prescription pills pending toxicology reports.

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