Not medical advice: Qsymia and Belviq are both available by prescription only. The best place to buy either one is your local pharmacy with a prescription from your doctor.
Qsymia is composed of phentermine and topiramate. The phentermine is intended to suppress appetite. Topiramate was developed as an anti-convulsive but has a side-effect of promoting weight loss.
Belviq is lorcaserin hydrochloride, which is an appetite suppressant.
It is encouraged that both medications are accompanied by proper diet and exercise. This requirement has led some to speculate about whether a healthy diet and exercise may not be the key, or majority of the key, to the medications’ successes.