Locklear’s meltdown fuelled by killer drug cocktail?

Heather Locklear’s recent string of meltdowns — already fuelled by a killer drug cocktail that included Valium, cocaine and Vicodin — were made more violent by a frightening new chaser: the attention deficit disorder drug Adderall.

A source close to the addiction-addled vixen claimed exclusively to RadarOnline.com that the 56-year-old actresss would mix Adderall pills with alcohol.

“She couldn’t be stopped!” said the source.

Medical experts believe the hopped-up star’s menu of drugs explains her insane behaviour. Worse, the mixture poses a lifethreatening crisis.

“You should never mix these drugs,” warned Dr. Stuart Fischer, who has not treated Heather. “When people take stimulants and depressants at the same time, they are unaware of the side effects of each.

“In combination, they cause manic medical and psychiatric disturbances. They can lead to potentially fatal cardiac-rhythm disturbances.”

Sources said she was downing Adderall like Pez.

“She would take double — or even triple — her daily dose,” revealed the source. “She’d run out of a week-long prescription in a few days and either freak out or just sleep.”

Dr. Fischer warned, “If they were fuelled by drugs, episodes like those that Heather have suffered are medical in nature — not psychiatric.

“She needs to be weaned off of both.”