nasal congestion
"Big mistake taking my first Claritin D 24 at  7PM for sinus pressure from using a nasal decongestant the day before and getting a rebound effect of clogged breathing passages. Didn't sleep a wink all night!! My nasal passages are wide open though, so it works. However, insomnia is a real pain. It's 6AM and I feel like it should be 1AM bedtime. I'll be struggling through the day today. Restless In Philly."