Nausea, vomiting, stomach upset, trouble sleeping, or increased urination may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. If your doctor has directed you to use this medication, remember that your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. Tell your doctor right away if you have any serious side effects, including: dizziness, mental/mood changes (such as nervousness, agitation), shaking (tremor), fast/irregular heartbeat. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Some products have ingredients that could raise your heart rate or blood pressure. Tell your pharmacist what products you are using, and ask how to use them safely (especially cough-and-cold products, diet aids, or headache medications). Avoid drinking large amounts of beverages containing caffeine (coffee, tea, certain sodas) or eating large amounts of chocolate while taking this medication. This medication may interfere with certain medical/lab tests (such as urine VMA/catecholamines levels, dipyridamole-thallium imaging test), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug.