FAQ: How do the diet drugs lorcaserin and phentermine-topiramate help people lose weight? Q: What is lorcaserin? Lorcaserin is a medication that is used to aid in weight loss by suppressing appetite. It works by targeting the serotonin receptors in the brain, which helps to control hunger and promote a sense of fullness. Lorcaserin is typically prescribed alongside a reduced-calorie diet and increased physical activity. More about lorcaserin Q: What is phentermine-topiramate? Phentermine-topiramate is a combination medication that is also used to assist with weight loss. It combines two drugs, phentermine (an appetite suppressant) and topiramate (an anticonvulsant). Phentermine helps…