The Home Improvement star voluntarily entered a clinic Thursday, said his spokeswoman, Marleah Leslie. The location and name of the clinic wasn't disclosed.
Allen, 44, pleaded guilty last year to drunk driving. The actor, who has a home in a Detroit suburb, was arrested in May 1997 in Bloomfield Township, Michigan.
His Ferrari was clocked at 70 mph in a 40-mph zone and police said his blood-alcohol level was 0.15 percent, above the legal limit.
"I had two Miller Lites on the golf course. And while my wife was having her head attended to somebody hit her with a golf ball or a golf club and she was bleeding I went to the Men's Grille and I had a vodka and orange juice," the Detroit Free Press quoted Allen as telling a judge.
"Then we went up to dinner and I had two more, and that did it," Allen said.
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