"Enter the Void"
Reminded me strongly of “Trainspotting” and “Requiem for a Dream” most obviously because they’re about hard drug use/addiction but also, there’s a theme of weird relationships in immediate families in all three -
"Trainspotting" lady’s baby dies because she neglects it
"Requiem" guy’s mom goes insane because she’s never around
"Enter the Void" weird sexual dynamic between brother and sister, and their parents are dead, and he dies