Levocetirizine is used to treat symptoms of allergic conditions such as allergic fever (hay fever), year-round allergies like dust or pet allergies and chronic nettle rash.
Montelukast is used to prevent and treat asthma, seasonal and year round allergies (hay fever), and prevent exercise-induced asthma.
Levocetirizine belongs to a group of medications called antihistamines. It acts by blocking a natural substance (histamine) that is produced in the body during an allergic reaction.
Montelukast belong to a class of medicines called leukotriene receptor antagonist (anti-asthmatic drugs). It blocks the action of certain natural substances (leukotrienes) that are involved in causing asthma and allergies. It makes breathing easier by reducing swelling in the airways.