Is there a weight loss medication in pill form?

Phentermine is used to speed weight loss in overweight people. It is used together with diet and exercise to treat obesity, especially in people with risk factors such as high blood pressure, high cholesterol, or diabetes.

Phentermine is similar to an amphetamine. It stimulates the central nervous system (nerves and brain), which increases your heart rate and blood pressure and decreases your appetite.

Phentermine belongs to a class of medications called anorectics. It works by reducing your appetite.

Source and more information:
https://www.drugs.com/phentermine.html