Hypersensitivity to levocetirizine, cetirizine, hydroxyzine or any piperazine derivative. Caution w/ alcohol intake. Patient w/ rare hereditary problems of galactose intolerance, Lapp lactase deficiency or glucose-galactose malabsorption. End-stage renal disease-patients undergoing dialysis (CrCl <10 mL/min). Not recommended in childn <6 yr.