According to the call placed to 911 on the night of Demi Moore's hospitalisation, the actress had smoked an unnamed substance which led to an adverse reaction.

The emergency call made by an unnamed friend of the actress was released on Friday and it gives some idea into what might be going on at the time.

"We need an ambulance here as soon as possible", Fox News quoted the female caller as saying.

"She smoked something, its not marijuana, but its similar to incense, and she seems to be having convulsions of some sort," she said.

The call begins with a great deal of confusion as to which department should be handling it. The phone is passed between several people, all expressing concern and frustration as to why the ambulance was taking so much time.

The dispatcher also seems frustrated at times with the caller, telling her "Ma'am, listen to what I'm asking you, pay attention, ok?"

The caller, who is unaware of Moore's age initially, describes her as semi conscious and barely awake. Her breathing is initially described as not so normal and the caller says the 49-year-old is burning up.

When the dispatcher asks what Moore took, the caller's answer appears to have been redacted before the audiotape of the call was released.

According to Tmz.com, paramedics on the scene were told by Moore's friends that she was doing whip-its. A whip-it is a canister of nitrous oxide, or the nitrous oxide found in a can of whipped cream.

Moore has since been placed in a rehab facility for exhaustion. The caller also revealed during the call that she has been having issues lately.

"She's been having some issues lately with some other stuff... So I don't know what she's been taking or not," the caller said.

When the operator asked the friend if this has happened before, she said, "I don't know. There's been some stuff recently that we're all just finding out."

By the end of the call, Moore seemed to have improved.

"She seems to have calmed down now. She's speaking," a male caller said. (ANI)