DRUG INTERACTIONS: Do not start, stop, or change the dosage of any medicine before checking with your doctor or pharmacist first.Before using this product, tell your doctor or pharmacist of all prescription and nonprescription medications you may use, especially: other products that contain caffeine (e.g., drugs used to treat migraines/headaches or prevent sleepiness), drugs that can harm the liver (e.g., acetaminophen, amiodarone, carbamazepine, isoniazid, methotrexate, methyldopa, "statins" such as atorvastatin and lovastatin), "blood thinners" (e.g., warfarin), drugs affecting liver enzymes that remove caffeine from your body (e.g., cimetidine, fluvoxamine, verapamil, quinolone/macrolide antibiotics such as ciprofloxacin and erythromycin, estrogens including hormonal birth control such as the pill/patch/ring), lithium, stimulants (e.g., amphetamine, ephedra/ma huang, pseudoephedrine), theophylline.Check the labels on all your medicines (e.g., cough-and-cold products, diet aids, headache medicines) because they may contain caffeine or other stimulants (e.g., ephedra/ma huang, phenylpropanolamine) that could increase your heart rate or blood pressure. Ask your pharmacist about using those products safely.While taking this product, avoid drinking large amounts of beverages containing caffeine (e.g., coffee, tea, certain soft drinks) or eating large amounts of chocolate.This product can interfere with certain medical/laboratory tests (e.g., chemical stress tests using adenosine/dipyridamole, urine tests for calcium/catecholamines), possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this product.Stop taking this product 24 hours before a dipyridamole or adenosine stress test and at least 4 hours before lung function tests. Ask your doctor for more details.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.
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