Has anyone who does not have epilepsy or migraine taken topiramate to reduce weight?

My dr. last week prescribed me topiramate while i am on Abilify (aripiprazole) to reduce weight that i have gained after taking antipsychotics. I put on 17 kgs in 3 months. I have tried dieting and exercise for 4 months with no success. If i take it for weight loss, how safe is the drug? how much weight loss should i expect to have? or should i go for other drugs like metformin, orlistat to reduce my weight?