http://www.medications.com/effect/view/28911 What's the safe replacement drug for Singulair? I took my son off it before and he had his worst asthma attack ever. I see all the same symptoms in my son who's 9 and has been on it for 4 years now. It's so scary. We're off to the doctors to see what can Tue, 01 Apr 2008 10:04:44 -0400 http://www.medications.com/effect/view/28911?item=6394 Good luck with your son's asthma management plan. I'm sure they'll figure it out, but it might be nerve wracking at first. When my son first came off it he did have a bad relapse, but eventually things evened out for him. We just went back to the old stand http://www.medications.com/effect/view/28911?item=6394