Girls, hello! Could you please tell me what to do with my 4-month-old …

Girls, hello! Could you please tell me what to do with my 4-month-old baby? His throat is red, he doesn't cough, but his voice became hoarse. The pediatrician prescribed Ergophen tablets, but the instructions say they can only be given to children from 6 months old. They prescribed Panavir Inlay for him. Have you ever given your babies these medications? Is there an effect?