When using this product a temporary, but harmless, darkening of the stool and/or tongue may occur. Ask a doctor or pharmacist before use if you are taking any drug for anticoagulation (thinning the blood) diabetes gout arthritis. 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. Stop use and ask a doctor if symptoms get worse or last more than 2 days. ringing in the ears or loss of hearing occurs diarrhea lasts more than 2 days 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. Ask a doctor before use if you have fever mucus in the stool a bleeding problem bloody or black stool. Allergy alert: Contains salicylate. Do not take if you are allergic to salicylates (including aspirin) taking other salicylate products. Do not use if you have an ulcer.