 [ Symptoms ] my 3 12 year old has strep and is taking amoxicillin can i give him benadryl to take for itchy feet [ Disease ] i would not recommend giving any benadryl at this time for the itchy feet if your son was allergic to amoxicillin he would have developed a rash all over his body and it usually happens right after the first or second dose i would recommend using a moisturizing cream on his feet to help keep the skin on his feet moist and may also help with the itching