Demi Moore's panicked friend told an emergency services operator she had "smoked something" and was suffering from "convulsions" on the night she was hospitalised.

The actress was rushed to Sherman Oaks Hospital on Monday evening (23.01.12), after suffering a seizure at a birthday party she was hosting at her home, and details of the frantic 911 call have now been released.

The star's friend can be heard saying: "We need an ambulance here as soon as possible. Why is an ambulance not on its way right now? She smoked something. It's not marijuana, but it's similar to, it's similar to incense, and she seems to be having convulsions of some sort."

The dispatcher then asked the terrified pal if Demi, 49, was conscious and breathing.

The friend replied: "Yes, well semi-conscious, barely ... And she's convulsing. She smoked something, but the reaction was accidental. It's accidental."

Another friend, a woman, then takes the phone and reveals Demi had taken another substance before the smoking incident.

The operator asks: "Is she breathing normally?"

To which the second person responds: "No, um, not so normal, but more sort of shaking, convulsing. But burning up ... She's been having some issues lately with some other stuff, so I don't know what she's been taking."

The name of the first substance was wiped from the recording that was released on Friday (27.01.12) because of federal patient privacy regulations.

A male friend then picks up The Call and tells the operator that Demi has "calmed down all of a sudden" and is "breathing fine".

Paramedics arrived at the actress' Franklin Canyon house in California shortly before 11pm on Monday and after treating her for 30 minutes at the property rushed her to Sherman Oaks Hospital.

Demi filed for divorce from Ashton Kutcher, her husband of six years, in November, after he was accused of cheating on her.

The 'Ghost' star has been alleged to be suffering from anorexia and substance abuse issues, including abusing the amphetamine-based prescription drug Adderrall which is used to treat narcolepsy.

Demi - who has three daughters with her ex-husband Bruce Willis - has also been reported to be hooked on the energy drink Red Bull.