Question: how much antihistamine can you give a child?
Answer: Adults and teenagers—25 to 50 milligrams (mg) every four to six hours as needed. Children 6 to 12 years of age—12.5 to 25 mg every four to six hours. Children 4 to 6 years of age—6.25 to 12.5 mg every four to six hours. Children and infants up to 4 years of age—Use is not recommended .