PK-PD Comparative Study of Lansoprazole Capsules and Lansoprazole Enteric-coated Capsules in Healthy Chinese Volunteers

Inclusion Criteria: * Subject who were healthy, adult, human beings within 18 and 60 years of age (both inclusive). * Male (weight ≥50kg) or female (weight ≥45kg); Subject having a body mass index between 19.0 and 26.0 (both inclusive), calculated as weight in Kg/height in m2. * Subject who totally understand the aim, procedure, benefits and adverse effects of this clinical trial, make decision by his/her free will, and sign a consent form to follow the progress; * The participant could communicate well with investigator, comply with and finish the study according to the procedure. Exclusion Criteria: * Subject who has past or present history of any serious diseases, including (but not limited to) digestive, cardiovascular, respiratory, urinary, musculoskeletal, endocrine, psychiatric or neurological, hematologic, immunological or metabolic disorders; * Allergy/hypersensitivity (including drug allergy) which is deemed relevant to the trial as judged by the investigator; * Intake of over the counter (OTC) or prescribed medications or vitamins or any traditional medicine products for the last 14 days before first dosing. * Has a special requirement for food and cannot adhere to a uniform diet or swallowing victims. * Cannot tolerate placement of the pH probe; * Venous puncture intolerable and/or blood phobia * Abused of tea, coffee and caffeine-contained beverages; or taking caffeine/xanthene containing food or beverages (like tea, coffee, chocolates and cola drinks) for the last 48 hrs before first dosing. * Habit of alcoholism; or frequent drinkers for the last 6 months before screening; or intake of any alcoholic products for the last 24 hrs before first dosing. * Regular smoker who has a habit of smoking more than five cigarettes per day for the last 3 months and has difficulty in abstaining from smoking during sample collection period. * Blood donation or blood loss ≥ 450 mL for the last 3 months before first dosing; or plan to donate blood or blood composition during the study or 3 months after the end of the study. * Intake of any enzyme modifying food or beverages for the last 48 hrs before first dosing. * Female detected to be pregnant, breast feeding or who is likely to become pregnant during the study; or subjects declined to practice non-pharmacologic prevention of birth control during the study. * Abused of drugs or Intake of drugs for the last 3 months before screening. * Subjects who had participated in any other clinical investigation using experimental drug/medical instrument/diagnostic reagent in past 3 months before screening. * Clinically significant abnormalities judged by investigators during screening test. * Positive breath test result for H pylori at Screening; * Confirmed positive in alcohol screening, smoking screening or selected drug of abuse. * Human immunodeficiency virus(HIV), hepatitis B virus (HBV), hepatitis C virus (HCV) or syphilis positive. * Other reasons for non-inclusion judged by investigator.