Heath Ledger's vast drugs prescriptions down to "sloppy prescribing"

Heath Ledger's toxicology results were released Wednesday, confirming that the 28-year-old 'Brokeback Mountain' star died of an accidental overdose, leaving the world wondering: Why was he taking six different medications? And how did he get them?

"At best it would be sloppy prescribing because there are duplicates of medications," Dr. Vatsul Thakkar, who did not treat Ledger, says.

Ledger was taking two opiates and four Benzos, or relaxers.

It’s common for patients to get different prescriptions from different doctors, unbeknownst to physicians.

Prescriptions can also be ordered illegally online – both domestically and overseas, say reports.

Ledger’s medications came from several sources – three were prescribed in Europe where he had been shooting his last film.

"If we had maybe an overarching system where doctors could easily communicate with each other, then maybe this could be avoided in the future," Thakkar tells old Access Hollywood.

Meanwhile, the New York apartment where Ledger died is going back on the market.

The luxurious 4,400sq-ft apartment, which Aussie Ledger started renting for $22,000-a-month in September, is being quietly shopped around, the New York Post reports. "You don't wait around in a hot rental market like this," one broker told the Post's Braden Keil.

"As ghoulish as it sounds, people will rent that place in a heartbeat, especially when the vacancy rate is below one per cent."

The fourth-floor apartment at 421 Broome Street includes three bedrooms, an office, a laundry room, a luxury kitchen and a balcony. It also has 15-ft ceilings, cast-iron columns, exposed brick walls and a wood-burning fireplace. Insiders say the apartment will be rented out for $25,000-a-month.