Before using Allegra, tell your doctor if you are allergic to any drugs, or if you have kidney disease.
FDA pregnancy category C. It is not known whether Allegra is harmful to an unborn baby. Before taking Allegra, tell your doctor if you are pregnant or plan to become pregnant during treatment. It is not known whether fexofenadine passes into breast milk or if it could harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.
Allegra tablets and capsules may be used to treat seasonal allergy symptoms in children who are at least 6 years old. Allegra oral suspension (liquid) may be used in children ages 2 through 11. When treating chronic idiopathic urticaria, the liquid may be used in children as young as 2 months old.