Movie about drug addicted girl and aggressive brother

My friend watched this not long ago. A strung- out girl and her boyfriend are meth heads, and the boy shoots her brother. Good movie- scary too. Not a very old movie at all. The brother tries to kill the spaced out boyfriend for getting his sister strung out ( I would too), but somehow the brother gets shot.

Every guess will be helpful.

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all creatures here below?

spun was very meth based too, but not ending like that