sir, I t ook my MRI 3 years back and was told that there is mild retnolisthesis of L5-S1. I took medicine pregabio - 75mg once daily with some vitamin an painkillers and was ok for almost 3 ys but recently again it started may its my fault t lifted water bucket. I started the same medine and i read some where that it puts on weight . I am 42 years  nad putting on weight what should I do. I am 5 ft 3 inch and weigh 56. kg.
Retrolisthesis is just a descriptive term to indicate one bone is misaligned on MRI more posteriorly than it should be but does not tell you why this is happening.  There are many reasons this can happen but the only treatment to correct it is surgical.  However this happens to many people and most people treat the pain symptomatically as you have.  There are many options besides pregabalin if you are concerned about the side effects.  You should discuss this further with your prescribing doctor