Investigate a Pharmacokinetics Between S-pantoprazole 20mg and Pantoprazole 40mg in Healthy Male Subjects

Inclusion Criteria: * Adult healthy males 20 to 45 years at screening. * BMI : 19kg/m2 \~ 26kg/m2 * Blood Pressure : "140 \> sitting SBP ≥ 90mmHg, 90 \> sitting DBP ≥ 60mmHg" Exclusion Criteria: * Have history of significant hepatic, renal, gastrointestinal, pulmonary, musculoskeletal, endocrine, neuropsychiatric, hematologic, cardiovascular diseases * Have a gastrointestinal disease(ex : Crohn's disease, gastrointestinal ulcer)or surgery(except for Appendectomy, Hernia repair) affected the absorption of medications * Have history of GERD, Gastric ulcer, Duodenal ulcer * Hypersensitivity reactions to drugs or clinically significant hypersensitivity reactions in the history of benzimidazole(ex:pantoprazole, NSAID, antibiotic) * Have a history of drug abuse * Unusual diet affected the absorption, distribution, metabolism, excretion of medications * Subject who treated with any investigational drugs within 90 days before the administration of investigational drug * Subject who takes inhibitors and inducers of drug metabolizing enzyme (Barbiturates etc.) within 30days * Previously donate whole blood within 60 days or component blood within 30 days or transfusion within 30 days * Subject who have taken habitually caffeine (caffeine \> 5 units/day) * Subject who have drunken habitually (alcohol \> 21 units/week, 1 unit = pure alcohol 10ml)or who are unable to quit drinking during this study or smoker * Subjects deemed ineligible by investigator based on other reasons