As stated on our packaging, not for use by those under the age of 18. Consult a physician before using this product. If you have, or have a family history of, heart disease, thyroid disease, liver disease, kidney disease, diabetes, high blood pressure, recurrent headaches, depression or other psychiatric conditions, glaucoma, difficulty in urinating, prostate enlargement, seizure disorder, if you are using a monoamine oxidase inhibitor (MAOI), anti-depressants, or any other medication, dietary supplement, prescription or over-the-counter consult with a physician. Discontinue use two weeks prior to surgery. Do not use if pregnant or nursing. Do not exceed recommended does. Contains caffeine. Do not use in combination with other caffeinated products. Dosage: One pack conatins 9 pills. See label for additional details.This product is labelled to United States standards and may differ from similar products sold elsewhere in its ingredients, labeling and allergen warningsCommon side efficts which include gastro-intestinal symptoms and, occasionally, rapid heartbeat.