Topamax maybe?
This isn’t geared towards anyone on PC but sometimes people have no choice when it comes to meds and weight gain. There’s lamictal and geodon is decent. There’s Wellbutrin if you don’t have anxiety issues. But sometimes there’s just no other option besides meds that cause weight gain. I was there personally when I was a teenager with many meds including Seroquel.
A girl I know was very underweight from an eating disorder. She was going inpatient multiple times, getting kicked out of multiple ED treatment centers and was having health issues. As a last resort her doctors put her on several meds that cause weight gain. Now she is morbidly obese but her mental health is so much better. Sometimes the ones that cause weight gain are the only options.
Again, not directed towards anyone here. Just a personal rant.