Mainline (2006)

Sara (Baran Kosari) is a bride-to-be who is struggling with her heroin addiction, which always seems to overpower her no matter how hard she fights. While her fiance is studying overseas, she has a relapse. Faced with his imminent return and, of course, the big wedding, Sara and her mother head for the countryside, seeking out a drug rehabilitation centre in a last-ditch effort to make her clean for good.