Active Addict Using During Solvaldi/Ribo Treatment

My boyfriend has been on solvaldi/Ribo combo for a month and a half now for Hep C. He's an active addict and is using while on the treatments. I'm not sure what he's using, it must be something that won't show up on drug screens because he's passing them. I don't know what to do. I am upset he's taking throwing away the chance for a cure and doesn't care. He almost overdosed the other day. Help. Tweet