Per Chew Warnings: 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. 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; a bleeding problem; bloody or black stool. Ask a doctor before use if you have: fever; mucus in the stool. Ask a doctor or pharmacist before use if you have or are taking any drug for: anticoagulation (thinning the blood); diabetes; gout; arthritis. When using this product a temporary, but harmless, darkening of the stool and/or tongue may occur. Stop use and ask a doctor if: symptoms get worse; 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.