Allergy medications can cause behavior/emotional problems.


I am a psychologist who serves children under 3 years old for a state public health agency.  My opinions, however, are my own and do not reflect those of the agency.

A nurse and I recently had a discussion about unusually aggressive and active behavior in a 2 year old.  The first thought of the nurse was that the child might be bipolar with psychotic features.  Then she mentioned that the child was taking Singulair (montelukast).  I asked whether she checked the potential behavioral side-effects of the medication.  I recommend that parents view the information that can be found in comments on  Before you have your acting out child labeled and treated for a psychological disorder, it is critical to consider any other potential cause for the problem.


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