Most commonly reported adverse effects include fatigue, headache, somnolence, dry mouth, gastrointestinal disorders, eg. nausea, gastritis and also allergic symptoms, i.e, rash. Loratadine may cause headache, thirst, blurred vision, dry mouth and dry nose. These effects should subside as the body adjusts to the medication. Loratadine does not usually cause drowsiness when used at recommended doses and under normal circumstances. May discolor urine (this is harmless).