Xyzal M Tablet is used to relieve allergic rhinitis. It contains Montelukast and Levocetirizine, which work by blocking the chemical messengers responsible for allergy. In some cases, this medicine may cause side effects like abdominal pain, dizziness, headache, fatigue, and sleepiness. Let the doctor know if you are pregnant, breastfeeding, taking any other medicines or have pre-existing medical conditions.