Many common antibiotics are used in children, but the amount is carefully calculated by weight or age and is usually given as a liquid for younger children. You should never give a child a dose intended for an adult or use leftover medicine.
Some antibiotics are generally avoided in children except in specific circumstances, because of effects on developing teeth or other concerns. A clinician will choose one suitable for your child's age.
Give the medicine exactly as prescribed, complete the course as directed, and tell the prescriber about any allergies. Seek urgent care if a child has difficulty breathing, a non-fading rash, persistent high fever, drowsiness, or is not drinking or passing urine.