Stop use and ask a doctor if - an allergic reaction occurs. Seek medical help right away. 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, ringing in the ears or a loss of hearing occurs, pain gets worse or lasts more than 10 days, new symptoms occur, fever gets worse or lasts more than 3 days, redness or swelling is present, these could be signs of a serious condition. Ask a doctor before use if - stomach bleeding warning applies to you, you have asthma, you have a history of stomach problems, such as heartburn, you are taking a diuretic, you have high blood pressure, heart disease, liver cirrhosis, or kidney disease. Reye's syndrome: children and teenagers who have or are recovering from chicken pox or flu-like symptoms should not use this product. When using this product, if changes in behavior with nausea and vomiting occur, consult a doctor because these symptoms could be an early sign of reye's syndrome, a rare but serious illness. Stomach bleeding warning: this product contains an nsaid, which may cause severe stomach bleeding. The chance is higher if you take blood thinning (anticoagulant) or steroid drug, have had stomach ulcers or bleeding problems, take more or for a longer time than directed, 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, are age 60 or older. Do not use - if you are allergic to aspirin or any other pain reliever/fever reducer, if you have ever had an allergic reaction to this product or any of its ingredients. If pregnant or breast-feeding, ask a health professional before use. It is especially important not to use aspirin during the last 3 months of pregnancy unless definitely directed to do so by a doctor because it may cause problems in the unborn child or complications during delivery. Keep out of reach of children. In case of overdose, get medical help or contact a poison control center (1-800-222-1222) right away. Allergy alert: aspirin may cause a severe allergic reaction, which may include: hives, shock, facial swelling, asthma (wheezing). Ask a doctor or pharmacist before use if you are taking a prescription drug for gout, diabetes, arthritis.