Vivitrol
"Be 100% sure all opiates and methadone are completely out of your system, I had taken 60 mgs of methadone 6 days before I got my shot, I told my doctor up front, and I am not a chronic methadone user, maybe used it 4-5 times in the span of 2 months when hydrocodone wasn't available. It threw me into the worst withdrawals of my life. And I have had severe withdrawal in the past but this was so very intense unlike anything, for 2 days straight. The doc said it would be fine at 6 days but he was wrong, 15 min after injection I went into full fledge withdrawal, severe cramps, spasms, fever, vomiting, freezing yet burning up. Make sure it is out of your body completely before you start, if you test positive for methadone don't take the shot wait it out."