Phentermine is a prescription medication primarily used as a short-term treatment for obesity. Here are some key points about phentermine: Appetite Suppressant: Phentermine is classified as an appetite suppressant. It works by affecting certain neurotransmitters in the brain to reduce appetite and increase feelings of fullness. This can help people who are struggling with weight loss by making it easier to consume fewer calories. Short-Term Use: Phentermine is typically prescribed for short-term use, often as part of a comprehensive weight loss program that includes diet and exercise. It is not intended for long-term use due to potential side effects and concerns about dependence.