Lindsay Lohan is coping well without Adderall.

The 'Liz & Dick' star initially ''lacked energy'' after being forced to come off her medication, which she claimed was to treat her ADD (Attention Deficit Disorder), after entering rehab but is doing much better now.

A source told gossip website that although the 26-year-old actress kicked up a huge fuss after being stripped of her medication, she is finally okay to be Adderall-free after recently moving from the Betty Ford Centre to Cliffside in Malibu, California, to complete her 90 days of court-ordered treatment.

The insider said that Lindsay's new medical team think she was wrongly diagnosed with ADD as a child and never needed the medication.

The 'Mean Girls' star is due to complete her treatment on July 31, which is part of a plea deal she struck to avoid jail after lying to police officers about driving in a car accident last year, and has told friends she is changing her ways.

A source previously revealed: ''She's 100 per cent determined to never go to rehab or get arrested again. She's serious this time and she's finally taking direction. She gets up at 7am, she's never late to the group meetings and she's the first one in the van when they go to AA meetings.

''She's still smoking but the techs tell patients not to try quit two addictions at once. She has also been told to stay away from dating for a year and she's up for it.''