Linda Suydam, president of the Consumer Healthcare Products Association, said the companies were voluntarily making the change "out of an abundance of caution." The association represents leading manufacturers and distributors of nonprescription, over-the-counter medicines and nutritional supplements.
The companies will also add a warning to their product labels saying parents should not give young children antihistamines to make them sleepy. Antihistamines are used to relieve allergies.
Government health officials said last week the issue needed additional study.