David Sheff
Nic Sheff
Karen Barbour
Vicki Sheff
Jasper Sheff
Daisy Sheff
Lauren
Julia
Gack
12-Year-Old Nic Sheff
8-Year-Old Nic Sheff
5-Year-Old Nic Sheff
Dr. Brown
Diane
Spencer
Destiny
Rose
Vince
Annie Goldblum
Julia's Mother
Kid
Flight Attendant
Nurse @ Bellevue
Airline Attendant
Speaker @ 12 Step Meeting
Minister
Wedding Guest
Father @ Graduation
Principal @ Graduation
EMT
Meeting Leader
Rocker (uncredited)