From the FDA Drug Label
Directions ... Children under 12 years: ask a doctor The FDA drug label does not answer the question.
From the Research
For a 3-year-old child weighing 15.3 kg, I strongly advise against using Pepto-Bismol (bismuth subsalicylate) due to the risk of Reye's syndrome, a rare but serious condition associated with salicylates in children recovering from viral illnesses. Instead, the child's pediatrician may recommend pediatric formulations specifically designed for young children, such as Pedialyte for dehydration or other medications that don't contain salicylates. The provided evidence does not directly support the use of Pepto-Bismol in children under 12 years of age, and the most recent studies focus on oral rehydration solutions and other treatments for acute diarrhea in children 1, 2, 3. It's essential to prioritize the child's safety and consult with their pediatrician for appropriate alternatives to treat their symptoms. Always measure liquid medications with a proper measuring device like a medication syringe or dosing cup, not household spoons, to ensure accurate dosing. The use of oral rehydration solutions, such as those described in the studies 1, 2, 3, may be a more suitable option for treating dehydration in children. However, it's crucial to follow the guidance of the child's pediatrician and adhere to the recommended treatment plan to ensure the best possible outcome for the child.