Changing behavior symptoms and conditions

Daughter just turned 2, started Singulair on her birthday, so it has only been 9 days. Already it has had such a positive effect on her reactive airway disease (a.k.a. asthma). In January, she had maybe a one-week break from constant runny nose, bad coughing, and 2 a.m. Albuterol treatments. Right after starting Singulair, she got a sniffle--which has always led to bad coughs, etc. But this time she dodged it.

About the same time, she has become more resistant to naptime. She used to just lie down and go to sleep, but lately she stalls and complains--like a typical 2-year-old. Of course, she was probably exhausted from coughing all night! Lately she'd been sleeping 7 pm to 8 am and then napping noon to five!

If it makes her only slightly more intense, I'll take that over worrying whether she's going to suffocate in her sleep. But, having read these comments, I will definitely keep a close eye on her! Pediatrician suggested we try taking her off it for the summer, and back on for the fall/winter.