Montelukast and Levocetirizine combination tablet guide: dosage, benefits, side effects, precautions, and FAQs for allergy and asthma relief... Compare Levocetirizine vs Montelukast head-to-head with other drugs for uses, ratings, cost, side effects and interactions. Know about Montelukast Levocetirizine tablet uses, benefits, dosage, and side effects. Get clear information for allergy and asthma relief. Levocetirizine + Montelukast is a combination of two medicines for allergies, hay fever and allergic skin conditions. It relieves sneezing, runny nose, watery eyes and cough by blocking histamine and leukotriene.