My daughter is almost 18 months. She has been sick a month. Started out as sinus infection, ear infection and tonsilitis. Then (while on antibiotics) got bronchitis. Then (still on antibiotics) Got tonsilitis again. (she has been on 5 different antibiotics and 2 antibiotic shots in 4 weeks) She was in the hospital for 2 days to get IV to hydrate her and more medicine. She had Xrays, blood work, throat swab and urine tests.
She had stopped eating and drinking, so the IV was a must! Her urine was very dark the morning she went to the hospital. It has only been 2 days, but seems better....time will tell. The doctors are keeping a close watch on her for now. Her latest diagnosis is persistent bronchitis and tonsilitis.

Since he is on medication which are not for children, I would be very concerned and get another pediatrician to handle his case. It really sounds as if he is being largely over medicated, which can worsen his symptoms. Please take him to another doctor. Good luck.