Cetirizine relieves allergic symptoms. Cetirizine is called a non-drowsy antihistamine; however, it can still cause drowsiness in a few people. Make sure your reactions are normal before you drive, or before using tools or machines.

Does montelukast make you sleepy?

No, montelukast should not make you drowsy. Antihistamines are a group of medications that are commonly used to treat allergies and one of the side effects of antihistamines is drowsiness. However, montelukast is not an antihistamine.

How long does drowsiness last with cetirizine?

The onset of effect occurs within 20 minutes in 50% of people and within an hour in 95%. Effects persist for at least 24 hours following a single dose of cetirizine.