my medicine is making me lose A LOT of weight

Sooo basically I just recently got diagnosed with adhd last semester (my first semester of college) and I tried a non stim first and had horrible side effects on me. My doc then advised I try extended release which also just didnt work for me. ive been put on 10mg of immediate release twice a day and its been working for my focus but it has seriously suppressed my appetite. I've lost like 15 pounds since christmas. has this happened to u?