Long-term use is not recommended. To avoid constipation, stop taking antidiarrheal medicines as soon as stools thicken.
If your child or teen gets chickenpox or flu, do not treat the symptoms with over-the-counter medicines that contain bismuth subsalicylate (such as Kaopectate and Pepto-Bismol). If your child has taken this kind of medicine and he or she has changes in behavior with nausea and vomiting, call your doctor. These symptoms could be an early sign of Reye syndrome, a rare but serious illness.
Ask your doctor if your child younger than 12 should take these medicines.