Ginger Snaps: Unleashed

'The late Ginger\'s sister Brigitte, now a werewolf herself, must try to find a cure for her blood lust before the next full moon while hiding out in a rehab clinic from a relentless werewolf.'

Ginger Snaps is a 2000 Canadian werewolf film directed by John Fawcett. The film focuses on two close teenage sisters, Ginger and Brigitte Fitzgerald (Katharine Isabelle and Emily Perkins), who are obsessed with death. The title is a pun on the biscuit of the same name. "Snap" also relates to losing one's self-control, or a quick, aggressive bite. During the film's production, the Columbine High School massacre and the W. R. Myers High School shooting took place, causing public controversy over the film's horror themes and the funding it received from Telefilm.

Source: Wikipedia