Xyzal dosage by age Some patients may be Adjuvant therapies, including emollients, topical corticosteroids, and oral histamine H1 receptor antagonists (such as ketotifen and levocetirizine), were prescribed based on the doctor’s assessment. + Children 6 to 11 years of age—2. Perennial Allergic Rhinitis. Seasonal Allergic Rhinitis: Less than 2 years: Not approved. Patients with impaired kidney function may be given a lower dose. The usual dose of Xyzal for adults and adolescents (12 years and older) is one tablet daily. Adults and Children 12 Years of Age and Older . Find the child's age in the top row of the dose table. Dosage for levocetirizine oral tablet hasn’t been established for children younger than 6 years of age. This medication is taken by mouth, typically once daily. utnqajogzkigxbowqdqtzjztvkanwpbsuuzqxlbiktpfrcwxfgqjjqycbfikbewhyqjhedqz