Phentermine is a prescription medication commonly used for short-term weight loss. It works as an appetite suppressant by stimulating the central nervous system, increasing heart rate and blood pressure, and reducing hunger cravings. By influencing neurotransmitters in the brain, Phentermine helps individuals eat less and feel full longer, supporting calorie reduction. Typically prescribed alongside a low-calorie diet and exercise program, it is most effective when combined with lifestyle changes. While Phentermine can accelerate weight loss, it is intended for short-term use due to potential side effects such as insomnia, dry mouth, and elevated blood pressure.