Phentermine is a medication primarily used for weight loss. It works by suppressing appetite and is often prescribed for short-term use. Common side effects include dry mouth, insomnia, and dizziness. The usual dosage is 15-37.5 mg once daily in the morning. It is important to follow the prescribed dosage and not exceed it. Consulting with a healthcare provider before starting Phentermine is crucial to ensure it is safe and appropriate for your individual situation.