Patients were randomly divided into two groups by Permuted Block randomization. The number of blocks was 2, 4, and 6. Then, with the random numbers generated by the computer, the arrangement of the blocks was determined, and the blocks were sorted in the order in which the two drugs were placed. Based on the arrangement, the two groups of drugs were each written in one sheet and placed in the same envelope with a three-digit code on it. After identifying the conditions of entry into the study, the physician referred the patient to the person who provided the envelopes, and the person submitted the envelope to the patient without knowing the contents of the envelope by inserting a three digit number on the patient's envelope. Then he opened the envelope pharmacy technician and, according to the inscription in the envelope marked A and B, provided the patient with the drugs named by the same name and no other information on the drug label. In this study, the doctor was unaware of the patient's position in the drug groups, the secretary and the pharmacist and the patient himself were unaware. At the end of the study, the three-digit code, patient group and results of the three stages (before the study, the second week, the fourth week) were delivered to the statistical adviser and the results were obtained.