When did you get your injection? Did they say if it would take a little time for your body to adjust to the injections?

I am not familiar with the atypical injections but have seen people who started slow-release injections of old drugs have some sedation/side effects for a month or two while their bodies adjusted. I can't remember which med it even was (they used one a lot where I used to work and I just know it was an old med and I should be able to come up with the name because I heard it plenty back then; hate my memory now) but then it would even out.