allergies
"Initially, levocetorizine worked very well in reducing cough and throat clearing. But as well as it worked for that, I felt sluggish during the day.. ( I'm took pill at night as prescribed ). I had very vivid dreams. I felt in the day as if I had a mild hangover. I cut the pill in half, so I had 2.5 mg instead of 5. Still felt groggy.  I then injested 1/4 of the pill, still groggy. I didn't take it at all last night, still vivid dreams, but no groggy in a.m. I'm going to ask Dr if there is another med for me, as side effects too tiring."