Unit count 200.0 millilitre(s). Units 200.0 millilitre(s). antihistamine liquid for kids. Cetirizine passes into breast milk. A risk of side effects in breastfed infants cannot be excluded. Zirtek Allergy film-coated (6+), Zirtek Allergy film-coated (6+), Zirtek Allergy for Children oral solution (6+) and Zirtek Allergy Solution oral solution (2+) contain cetirizine dihydrochloride.