How do weight loss drugs work?
First things first. Weight loss drugs currently available in the market work through 1 or a combination of the following mechanisms:
- Curb appetite: They affect various appetite-regulating transmitters, such as serotonin, dopamine, and norepinephrine. Phentermine is an example of an appetite-curbing weight-loss drug.
- Promote satiety: They do so by slowing gastric emptying (i.e., the rate at which food empties from your stomach) and/or mimicking hormones that tell your brain that you’re full. Examples of weight loss drugs in this category include Wegovy and Mounjaro.
- Block fat absorption from food: This category has only 1 FDA-approved weight loss drug. Orlistat. By blocking the enzyme that breaks down fats in your diet, orlistat significantly reduces your total calorie intake.




