It’s not working

I’ve been taking the 2.5, 5.0 and I have only lost 6 pounds. It’s been 6 months. Nothing is happening? I also have very few side effects, some nausea and constipation. I have the 7.5 and 10 shots in my frig but wondering if this med is working on me like others or maybe I need a different med? Thought 💭