I am currently going off my methadone and am on 21 mgs. I've been on it 5 years. For the past few months I've been in constant fear of being sick, so before I would go down on my dose, i would extract a little of my dose myself and store it in a pill bottle. It takes over a week for them to put me back up on my dose if I become sick. That way, when they lower my dose enough when it will affect me, i can take a little it of it and make it thu the week. But I'm not sure how long it can be stored for without going bad?