My doctor gave me methadone 10mg to try out because the 15mg roxicodone is not helping with my pain anymore. But I have never heard of this medicine before and he wants me to take it at bedtime. But before I do that I want to make sure I dont have any reactions from it so I want to take it during the morning hours to see how I react to it. So I was wondering how long it lasts for so I know when I can take my other pain meds... Thank you