Reyes syndrome: children and teenagers should not use this product for chicken pox or flu symptoms before a doctor is consulted about Reye's syndrome, a rare but serious illness reported to be associated with aspirin. Allergy alert: magnesium salicylate may cause a severe allergic reaction which may include: hives, facial swelling, asthma (wheezing), shock. Stomach bleeding this product contains a non-steroidal anti-inflammatory drug (NSAID), which may cause severe stomach bleeding. The chance is higher if you: are age 60 or older have had stomach ulcers or bleeding problems take a blood thinning (anticoagulant) or steroid drug take other drugs containing prescription or nonprescription NSAIDs [aspirin, ibuprofen, naproxen or others], have 3 or more alcoholic drinks every day while using this product take more or for a longer time than directed. Do not use if you have ever had an allergic reaction to any other pain reliever/fever reducer. Ask a doctor before use if: stomach bleeding warning applies to you, you have a history of stomach problems, such as heartburn, you have high blood pressure, heart disease, liver cirrhosis or kidney disease you are taking a diuretic. Ask a doctor or pharmacist before use if you are: taking a prescription drug for diabetes, gout or arthritis, taking any other drug. When using this product, limit the use of caffeine-containing medications, foods or beverages because too much caffeine may cause: nervousness, irritability, sleeplessness, occasional rapid heart beat (the recommended dose of this product contains about as much caffeine as one cup of coffee.) Stop use and ask a doctor if: an allergic reaction occurs (seek medical help right away) pain gets worse or lasts more than 10 days, fever gets worse or lasts more than 3 days, redness or swelling is present, ringing in the ears or loss of hearing occurs, any new symptoms appear, you experience any of the following signs of stomach bleeding: feel faint, vomit blood, have bloody or black stools, have stomach pain that does not get better. If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children. In case of overdose, get medical help or contact a poison control center right away. Each diurex blue colored, round shaped pill bears the identifying mark alva and is sealed in a clear plastic blister with a foil backing. Do not use if seal appears broken or if the product contents do not match product description.