The single-dose randomized, open-label, two-period crossover study was executed in the Phase I Clinical Research Center of the Affiliated Hospital of Qingdao University. According to the random table generate by SAS 9.4, the subjects were divided into two groups at the ratio of 1:1. The select qualified volunteers were hospitalized in the Phase I Clinical Research Center, and fasted for 10 hours overnight until administration. The medicine was swallowed with 240 ml water at room temperature. Blood samples were taken before administration and at 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 24, 36, 48, 72, 96, 120, 144, 168 hours after administration. The samples were centrifuged at 1,800 g for 10 min at 4 °C to separate the plasma. The plasma samples were divided into two aliquots and stored at -80 °C until bioanalysis. The half-life of levamlodipine is 30 ~ 50 hours. Washout period, the interval between two administration, is 21 days. In the two periods, the operation was kept the same.

Moreover, in high fat meal group, the high-fat breakfast was arranged within half an hour before taking the medicine. Other procedures were the same as those in the fasting group.

Inclusion Criteria:

• Healthy male or female aged 18 and above.
• The body mass index is in the range of 18.6-28.5 kg/m2 (including the critical value). The weight of male is not less than 50.0 kg, and that of female is not less than 45.0 kg.
• The following examination show that the indicators are normal or abnormal without clinical significance. The examination including: Vital signs, physical examination, blood routine, blood biochemistry, urinalysis, pregnancy test for female, serological tests for hepatitis B virus, hepatitis C virus, human immunodeficiency virus (HIV), and syphilis virus, 12 lead ECG, breath test for alcohol, drug abuse test.
• The subjects have no family planning within 3 months and could select contraceptive method.
• Before the study, all subjects have been informed of the study's purpose, protocal, benefits, and risks, and signed the informed consent voluntarily.

Exclusion Criteria:

• Being allergy to the study medications, smoking, alcohol abuse.
• Participation in another clinical trial within 3 months.

The technical achievements (including but not limited to patent right and thesis publishing right) involved in this trial, clinical research materials and achievements are owned by Zhejiang onlycom Pharmaceutical Co., Ltd. With the written consent of Zhejiang onlycom Pharmaceutical Co., Ltd., all partners have the right to publish academic papers, and the Affiliated Hospital of Qingdao University, a clinical research institution, has the right to exchange research results in academic conferences or journals.

The data have been available on February 15, 2019. The duration has not been determined.