(6 yr old boy)Its been 2.5 weeks off the Singulair and the side effects have become less frequent and less intense but are still there. He still has a bit of an explosive temper, still having these shaking fits where he says its like his hands and arms just do what they want. Diarrea, nightmares less frequent. It has been so hard for us to deal with, mainly the erratic movements because they are involuntary though this is only happening for 10 minutes at a time now where it was 2 hours (with arms and legs going and buzzing for those of you who hadn't read my previous post.).