Super easy. I took Imodium for a couple of days at the 3 month mark for some very minor digestive symptoms.
The "worst" part of quitting Sublocade so far was the one day, also around 3 months, when I felt a little tired and my emotions came back. I felt like I had the most mild cold ever, but what bothered me was the intense fear that I was about to go into legitimate withdrawal.
8 hours later I felt fine and have felt fine since.