The Lost Weekend.

Ray Milland stars as alcoholic New York writer Don Birnam (Ray Milland) with his girlfriend Helen (Jane Wyman) and brother Wick (Philip Terry), who is trying to discourage his drinking. Don is broke, broke, and spends the day drinking in an alcoholics' ward. On Monday, still broke, Don steals a bottle of whisky from a store and spends a day drinking. While visiting a girl who has had a crush on him, he falls down the stairs and is knocked unconscious.