Hi, my kid is 3.6 years old. He has diagnosed with allergy for paper dust. Doctor prescribed him Lmontus kid. But after 2-3 months he was experiencing severe constipation. So the same doctor changed the prescription to Montair 4mg. After that everything was fine. But now (after 3 months) again he is experiencing severe constipation. His medical history is like he was having tetralogy of fallot and he was operated when he was 2 months old. He was also operated for his anus as his anus was not at the correct position when he was 5 months old. Please advise if Montair 4mg is affecting his digestion? Thanks.