hi there, your concern is very valid and let me assure you that advil
together ar e not harmful to your child.Prolonged course of antibiotics are definitely not good for anyone but then as your child is suffering from infection it needs to be given. To decrease the side effects of long term use of antibiotics you may also give your child probiotics along with the other tablets. It will help to maintain the normal flora of the GIT. Also give him plenty of fluids, some vitamin suppliments and healthy diet to overcome the weakness. Take care.