nasal congestion
"Doctors gave this medicine to me thinking I had allergy. I thought it was cold. I didnot have any runny nose, itchy eyes or anything as mentioned on the label of the box. I took Claritin-D 12 hrs when I felt I got congestion in nasal passage and felt like mucus was passing through the passage between nose and throat all the time and got different side effects all the time. 
This time I had severe side effects like started feeling feverish, heart was pounding faster, felt extremely weak; then I read about the side effects on this website."