Your son's restlessness and bad dreams may be due to the Singulair. These side effects are not very common at all but they can occur in some young children on this medicine. Singulair should always be given at night before bedtime. There are many other treatment options available for asthma and your doctor will advise you what to use.
Unfortunately your son's 2 colds have made things bit difficult,but he is much better from the asthma point of view.
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