I've been on vyvanse for ADHD for little over a year, it has turned my life around. But for the past month it has been losing effectiveness dramatically and now it barely works. I'm wondering if I've finally had a poop out or not. I should add that my last bottle was left in a room with a humidifier for three days, which is when this started. But now I've gotten a new bottle (undamaged by humidity) and things have not gotten better, I've never heard of vyvanse pooping out like this. Has anyone else have this happen?