Daniel Radcliffe drank.
In an interview with Off Camera, Daniel Radcliffe says he drank a lot to deal with his Harry Potter fame saying, “there is no blueprint for child actors to deal with fame.”
He says he would get drunk to deal with people watching him and would continue to drink to make that feeling go away. Then he woke up one day and realized, “this probably isn’t good.”
Now, Daniel says he never drunk while on set but he did show up drunk after a night of heavy drinking, “I can point to many scenes where I’m just gone. Dead behind the eyes.”