Are there any reasons not to use it/label warnings?

Do not use if you are allergic to aspirin. Children and teenagers should not use this product for chicken pox or flu before consulting a doctor about Reye's Syndrome, a rare, but serious illness reported to be associated with aspirin. If you are pregnant, do not use this product during last three months of pregnancy unless directed by a doctor. If you consume three or more alcoholic drinks per day consult your physician before taking this product. Aspirin may cause stomach bleeding.