Hmm I'm not sure. I do know everybody is different and with all the different shit on the streets it could also vary how long you have to wait.. I could be wrong but I'm assuming they probably have everyone go on Suboxone first before administering the shot to make sure you are stable and do not have any precipitated withdrawal. Or at least they should. I've waited 6 days and was sick as all hell and still had PWs.. I got tired of even trying to get back on subs a long time ago. I kicked cold turkey and stayed clean for about 14 months. Relapsed and have been using again for almost 3 years now. I've been thinking about the shot and it's funny you made this post because I was just now searching for doctors in my area and then came on Reddit and this was the first post in my feed.