Phentermine is typically prescribed as part of a comprehensive weight loss program that includes dietary changes, exercise, and behavioral modification. It is intended for short-term use, usually for a few weeks or months.

Mechanism of Action: Phentermine works by increasing the release of neurotransmitters such as norepinephrine, which suppress appetite and reduce food intake. It also stimulates the release of dopamine and serotonin, which can help improve mood and reduce cravings.

Dosage and Administration: Phentermine is usually taken orally as a tablet or capsule, typically once daily in the morning or before breakfast. The dosage may vary depending on factors such as the individual's weight, response to treatment, and presence of any medical conditions.

Side Effects: Common side effects of Phentermine may include dry mouth, insomnia, dizziness, headache, and constipation. More serious side effects, such as increased heart rate, high blood pressure, and shortness of breath, can occur but are less common.

Contraindications: Phentermine is contraindicated in individuals with a history of cardiovascular disease, uncontrolled hypertension, hyperthyroidism, or glaucoma. It should also be avoided in pregnant or breastfeeding women.