This medicine is usually very safe. Very occasionally a child may develop side effects which may be have happened with your baby.The problem I have here is how can a child of 15 months have excercise induced asthma? This kind of asthma is only seen in older children and requires running constantly such as occurs with rugby or soccer before the asthma starts.Your baby needs to be seen again and it would be best to stop the Singulair as he appears not to be able to tolerate this medicine. A clear diagnosis of his problem is essential.
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