Phentermine is a prescription medication that is used to help with weight loss. It is classified as a sympathomimetic amine and works by suppressing appetite and increasing energy expenditure.

Phentermine is typically prescribed to people who are obese or who have a body mass index (BMI) of 30 or higher. It is usually used in combination with diet and exercise to help with weight loss.

Common side effects of phentermine may include dry mouth, constipation, insomnia, dizziness, and elevated blood pressure. More serious side effects can include chest pain, difficulty breathing, and swelling of the feet or ankles.

Phentermine is classified as a Schedule IV controlled substance in the United States due to its potential for abuse and dependence. It is important to take phentermine only as directed by a healthcare professional and to use caution when driving or operating machinery, as it can cause dizziness and impair thinking and reaction times. Phentermine should never be shared with others, as it can be dangerous or fatal if misused or abused.