Hello Doctor, My Son Is 6yrs Old. Not Shown Interest

Hello Doctor,

My son is 6yrs old. Not shown interest in studies. So I took him to psychiatrist. She prescribed attendrol 18mg. But I got only 10mg and gave for 1 day. he got two lumps in hand and leg. I shown to doctor. she said it is insect bites since the lumps are warmth. so asked to continue. so I gave the second tablet next day. after that he got body full of lumps and heavy itching. how to get rid of this. very much worried. gone to general doctor. prescribed with allegra syrup. will it help...pls help me