At times I hear parents tell me that their child is allergic to Amoxicillin. So, the next question I ask is what kind of reaction did the child have? The responses I get are variable: the child developed vomiting/diarrhea after taking medicine or developed a skin rash. Some parents also report that the sibling or one of the parents is allergic to it so we never gave it. Very rarely I get to hear the child had breathing difficulty or swelling of lips/face where the child neede