I just wanted to thank "Guest #12880" for posting before and after symptoms. As a parent with a child who experienced a mood disorder on this drug I realize how essential it was for me in researching the drug's side effects for me to have adult descriptions of how Singulair makes a person feel. It's so difficult for parents to decipher what is going on with their kids sometimes, especially between ages 2 and 6. Adult descriptions helped me validate what I already suspected and hopefully your descriptions will help other parents as well. Best of luck to you.