I am afraid to say, but yes it will cause you to gain weight. Not near as much as if you were on methadone. Look at the bright side, aren't you seeing things more clearly. I have been on suboxone for 11 months and over the Winter I gained 15 lbs. That put me at a weight I had never seen before. It has really gotten warm here early, so with my outdoor activities I have actually lost the 15 lbs. Hang in there.