In her teens she went to 12 Step Meetings (A.A.), stopping ingesting all substances and admitted to being an alcoholic.

Then at some point she decided she was a "normie" and resumed drinking.

Well, that hasn't worked out so well for her. In 2018,
Drew Barrymore Apologizes for Drinking Too Much on WWHL | PEOPLE.com
she showed up drunken to television talk show interview, and admitted that cocaine "literally seems like my worst nightmare right now."

Until she goes back to total abstinence, it is to be expected that her alcoholism and addiction disease will progress.