My son took singulair for over two years. He is now 9. Foe the ...

My son took singulair for over two years. He is now 9. Foe the last few years he has had a Jekyl & Hyde personality. Sweet as can be one minute then he will fly off the handle, calls us names, screams, breaks furniture. He also becomes emotional very easily. We have been baffled as out two other sons have never behaved in this way. I am now wondering if there is a connection with his behavior issues and his having taken Singulair for a long term.