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PRECAUTIONS: Before taking this product, tell your doctor or pharmacist if you are allergic to it; or to caffeine or other xanthine drugs (e.g., theophylline); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.If you have any of the following health problems, consult your doctor or pharmacist before using this product: heart disease (e.g., irregular heart rhythm, recent heart attack), high blood pressure, mental/mood disorders (e.g., anxiety, nervousness), stomach/intestinal ulcers.Liquid forms of this product may contain sugar and/or alcohol. Caution is advised if you have diabetes, alcohol dependence, or liver disease. Ask your doctor or pharmacist about using this product safely.Guarana must not be used during pregnancy. If you become pregnant or think you may be pregnant, tell your doctor immediately.It is unknown if this product passes into breast milk. Consult your doctor before breast-feeding.

DRUG INTERACTIONS: Before using this product, tell your doctor or pharmacist of all prescription and nonprescription/herbal products you may use, especially of: adenosine, certain asthma medications (theophylline, beta agonists such as albuterol), certain herbal products (bitter orange, ephedra/ma huang), ciprofloxacin, clozapine, creatine, disulfiram, drugs affecting liver enzymes that remove caffeine from your body (such as cimetidine, fluvoxamine, mexiletine, macrolide antibiotics including erythromycin), lithium, other stimulants (e.g., amphetamine, methylphenidate), riluzole.Check the labels on all your medicines (e.g., cough-and-cold products, diet aids, headache medications) because they may contain caffeine or other ingredients that could increase your heart rate or blood pressure. Ask your pharmacist about using those products safely.Avoid drinking large amounts of beverages containing caffeine (coffee, tea, certain sodas) or eating large amounts of chocolate while taking this product.This product may interfere with certain medical/laboratory tests (including urine VMA/catecholamines levels, dipyridamole-thallium imaging test), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

Report Problems to the Food and Drug Administration   You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.