Hi please tell me about loratadine maximum dose?

Depends: Loratadine is FDA approved for 10mg once daily for the treatment of allergic rhinitis. It is often used at twice daily doses in the treatment of chronic hives, but this is not FDA approved. There is however a large amount of safety data accumulated for using it as this dose. It has been studied at doses as high as 40 mg per day but at that dose is sedating.

Daily dose: Adult dosage of loratadine should not exceed 10 mg per 24 hours in normal people. In people with kidney or liver impairment , the dosage should not exceed 10 mg every 48 hours. Reference: Medscape Drug Refernce