Precautions While Using This Medicine

Your doctor should check your progress at regular visits , especially for the first few weeks after you begin using this medicine. A blood test may be taken to help your doctor decide whether the dose of this medicine should be changed.

Do not change brands or dosage forms of this medicine without first checking with your doctor . Different products may not work the same way. If you refill your medicine and it looks different, check with your pharmacist.

A change in your usual behavior or physical well-being may affect the way this medicine works in your body. Check with your doctor if you :

• have a fever of 102 °F or higher for at least 24 hours or higher than 100 °F for longer than 24 hours.
• start or stop smoking.
• start or stop taking another medicine.
• change your diet for a long time.

This medicine may add to the central nervous system (CNS) stimulant effects of caffeine-containing foods or beverages such as chocolate, cocoa, tea, coffee, and cola drinks. Avoid eating or drinking large amounts of these foods or beverages while using this medicine. If you have questions about this, check with your doctor.

Before you have myocardial perfusion studies (a medical test that shows how well blood is flowing to your heart), tell the medical doctor in charge that you are taking this medicine. The results of the test may be affected by this medicine.