Is it possible to lose weight on mirtazapine?

I'm on Mirtazapine 15mg. I've gained a significant amount of weight despite exercising regularly. I decided enough was enough. I started to track my calories and remain in a calorie deficit. I still gained weight... is it possible to lose weight on Mirtazapine? Has anyone done it? I legit tracked my macros and exercise/activity and instead of seeing improvement, I continued to gain. This works so well for depression, but I can't keep putting on weight.