When you use Decatrim and stop after desired results, do you gain the weight you lost back?

I'm planning on starting this pill and diet regimen and I wanted to know whether people who have taken Decatrim have gained the weight they lost back. And I'm not planning on eating junk food after I lose the weight. I'm still planning on eating healthy and exercising to try and maintain my weight loss, but I want to know if it's any use to buy the pill if I'm going to gain the weight back after I stop using it. Any experiences from using this product would be greatly appreciated too! Thank you!