Claritin 5 mg is the standard dose for children under 10 years old and can take 12 hours at intervals for a few days. The doctor or physician has prescribed Claritin 10 mg to the adult and older person once a day in the morning or at night, with or without food for a few days. The medicine stops the itching of the nasal, sneezing, runny nose, mucosa and nasal congestion, irritation from skin reactions, etc.