• Levocetirizine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms such as a runny nose or hives.
• It works by blocking a certain natural substance (histamine) that your body makes during an allergic reaction.

• Levocetirizine is used to treat symptoms of year-round (perennial) allergies in children who are at least 6 months old.
• Levocetirizine is also used to treat itching and swelling caused by chronic urticaria (hives) in adults and children who are at least 6 months old.

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

• Stop using levocetirizine and call your doctor at once if you have:
•  worsening allergy or urticaria symptoms;
•  painful or difficult urination;
•  little or no urination;
•  a light-headed feeling, like you might pass out;  fever; or signs of an ear infection--ear pain or full feeling, trouble hearing, drainage from the ear, fussiness in a child.
•  drowsiness, tiredness;
•  sinus pain;
•  ear infection;
•  cough;
•  fever;
•  nosebleed;
•  vomiting, diarrhea, constipation;
•  dry mouth; or
•  weight gain.

•  You should not use levocetirizine if you are allergic to levocetirizine or cetirizine (Zyrtec).
•  You should not take levocetirizine if you have end-stage kidney disease or if you are on dialysis. Any child younger than 12 years old with kidney disease should not take levocetirizine.

 Tell your doctor if you have ever had:

•  kidney disease;
•  liver disease;
•  urination problems (caused by conditions such as enlarged prostate or spinal cord lesion); or
•  gallbladder problems.
•  Levocetirizine is not expected to harm an unborn baby. Tell your doctor if you are pregnant.
•  You should not breast-feed while using this medicine.
•  Levocetirizine is not approved for use by anyone younger than 6 months old.