allergic rhinitis
"Am a senior citizen.  Took Singulair for 2 years.  In that time I have suffered from persistant anxiety (felt like I was going to explode), something I never had before, and was also having weird dreams.  I was sent to a psychiatrist, was told I was depressed and given anti-depressants.  But I knew it was something chemical.  Finally searched for "Singulair + anxiety" and found many other people had had problems.  Within 3 days of discontinuing the medication I felt pretty much "normal".  I would rather have the runny nose/sneezing than that terrible anxiety!"