My husband accidentally gave our 15 month old son, his brother's Amoxicillan 400MG from the Dr. Our other son is 3 yrs old, and his dosage is 5 milliliters every 12 hrs. He has taken Amoxicillan befre, and is not allergic. They are both sick, but he clearly should not have been given his brothers meds. I want to make sure he is ok, and find out if there is anything I should look for? Thanks for any answers