Question: how much antihistamine can you take?
Answer: For oral dosage forms (capsules, tablets, or liquid): Adults—25 to 50 milligrams (mg) every four to six hours as needed. Children 4 years of age and older—1 to 1.5 mg per kg (0.45 to 0.7 mg per pound) of body weight every four to six hours as needed. Children and infants up to 4 years of age—Use is not recommended .