allergic rhinitis
"I began taking this medication on Saturday and by Monday (3 days later), I felt awful. I had a general feeling of illness; nausea; and pain in my back, legs, arms and hands to the extent that I had to take Oxycodone. The med did seem to be working somewhat because I was feeling less drainage in my throat, but not enough to cut out Claritin and Sudafed. In case my symptoms were the result of something else, I'm going to try Montelukast again in a couple weeks."