Phentermine is a prescription medication that is primarily used as an appetite suppressant for short-term weight management in individuals who are overweight or obese. It is classified as a sympathomimetic amine and works by stimulating the release of certain neurotransmitters, such as norepinephrine, in the brain, which helps to decrease appetite and increase feelings of fullness.

Phentermine is typically prescribed as part of a comprehensive weight loss program that includes dietary changes, exercise, and behavioral modifications. It is intended for short-term use, usually a few weeks or months, due to its potential for tolerance and the development of dependence.

As with any medication, phentermine can cause side effects. Common side effects may include increased heart rate, elevated blood pressure, insomnia, dry mouth, restlessness, and constipation. It may also have interactions with other medications, so it is important to inform your healthcare professional about any other drugs you are taking.

Phentermine is a controlled substance in many countries due to its potential for misuse and addiction. It is classified as a Schedule IV controlled substance in the United States. Misusing or exceeding the recommended dosage of phentermine can lead to serious health risks and adverse effects.