"He has completed treatment," his publicist told the News on Sunday.
Arquette, 39, reportedly sought help for alcohol addiction and emotional issues.
He separated from wife Courteney Cox, 46, last year and spent much of the end of 2010 partying and surprising fans with his candid talk about his marriage problems.
Arquette attributed his behavior to being "heartbroken."
Cox has stood by her estranged husband as he battled his demons.
"I really admire David and his choice to take charge and better his life," she told People shortly after Arquette entered treatment.
David Arquette Out Rehab
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