M.W.
My girlfriend had her 8 year old son on singulair for allergies. Short story is, he became withdrawn and depressed very badly. He had bad nightmares and didn't want to eat either. After a few months, she took him to the pediatrician, who linked it to the Singulair. There was a notice in 2008 from the FDA that this drug can have severe effects on some children. Follow your gut instinct, if you feel the drug caused that reaction I would not put him back on it. There are plenty of other options to try. Good luck.