Keratan is best taken at night, on an empty stomach before bedtime. Capreotide, also known as loratadine, is rapidly absorbed on an empty stomach, taking effect in 1-3 hours and reaching maximum drug effect after 8 hours, with a long duration of effect. Food can slow down the absorption of capretastatin and delay the peak concentration of capretastatin and affect the therapeutic effect of the drug. Capreotide competitively inhibits histamine receptors, thereby suppressing the allergic symptoms caused by histamine. It is commonly used in the treatment of allergic rhinitis to relieve nasal congestion, runny nose, sneezing, nasal itching, and red itchy eyes. It is also used to relieve the symptoms of chronic urticaria, pruritus and other allergic skin diseases. Adverse effects of Keratan include drowsiness and fatigue. In summary, Keratan is best taken on an empty stomach before bedtime.