Let's take a minute to talk about your medication. 

This is phentermine, and you should take it as directed. Don't take it in the evening, or you might not sleep well. 

Phentermine curbs your appetite to help with weight loss. It can only be taken for a few weeks, or it could become habit-forming. 

You could have mild dizziness, tremors, or mood changes. So, don't do activities that require you to be alert, like driving, until you know how it affects you. Other common effects are a dry mouth, unpleasant taste, itching, or stomach upset. If these or other side effects become reasons you want to stop taking it, please talk to your doctor or pharmacist. 

Serious side effects could happen, like a very rare, sometimes fatal, lung disease. So, get immediate help if you notice unusual changes to your body, like shortness of breath, chest pain, fainting, ankle swelling or a new intolerance to exercise. Another rare condition is a heart valve problem, so get help right away if you have changes to your heartbeats or unexplained fatigue. 

To reduce side effects, you should ask your doctor or pharmacist before you take any new medicines or drink alcohol. For safety, check your blood pressure at the same time each day, and report high readings to your doctor. 

Women should not be pregnant or breastfeed, because it could harm the baby. 

Lastly, it's unsafe for others and it can be abused. So, store it securely and ask your pharmacist how to dispose of unused pills. 

For best results, also follow the diet and exercise program recommended by your doctor.