To assess the bioequivalence of a single dose of ASP1941 between tablet-1 and tablet-2 in a two-way crossover method in non-elderly healthy male subjects. In addition, the safety of these products will be assessed.

This study is a open-label randomized two-way crossover study. A single dose of two types of ASP1941 tablets are given to non-elderly healthy male subjects (16 subjects for each group, 32 subjects in total).

In case the bioequivalence of the 2 formulations cannot be proved in this study due to insufficient number of subjects, an add-on subject study will be conducted in this clinical trial as needed. Same design and methodology are to be applied to this study and the add-on subject study. The add-on subject study may not be conducted.

Inclusion Criteria:

• Body weight (at screening) >=50.0 kg and < 80kg
• BMI >= 17.6 and < 26.4 (BMI = Weight (kg)/(Height (m))2)
• Healthy, as judged by the investigator/sub-investigator based on physical examinations (subjective symptoms and objective findings) and all tests obtained at screening and during the period from hospital of the period 1 admission to immediately before study drug administration

Exclusion Criteria:

• Received or scheduled to receive any investigational drugs in other clinical trials or post-marketing studies within 120 days before the screening or during the period from screening to hospital admission of the period 1 (Day -1).
• Donated or scheduled to donate more than 400 mL of whole blood within 90 days before the screening, more than 200 mL of whole blood within 30 days before screening, blood components within 14 days before screening, or whole blood or blood components during the period from screening to hospital admission of the period 1 (Day -1).
• Received or scheduled to receive medications (including OTC drugs) within 7 days before hospital admission of the period 1 (Day -1).
• A deviation from the normal range of blood pressure, pulse rate, body temperature, or standard 12-lead ECG at screening or hospital admission of the period 1 (Day -1)
• Concurrent or previous drug allergies
• Development of upper gastrointestinal disease (e.g., nausea, vomiting, and stomachache) within 7 days before hospital admission of the period1 (Day-1)
• Concurrent or previous hepatic disease (e.g., viral hepatitis, drug-induced hepatic disorder, and hepatic function disorder)
• Concurrent or previous heart disease (e.g., congestive cardiac failure, angina pectoris, and arrhythmia requiring treatment)
• Concurrent or previous gastrointestinal disease (e.g., peptic ulcer and reflux esophagitis), except for a history of appendicitis
• Concurrent or previous renal disease (e.g., acute renal failure, glomerulonephritis, and interstitial nephritis), except for a history of renal calculus
• Concurrent or previous endocrine disease (e.g., hyperthyroidism and blood abnormal growth hormone)
• Concurrent or previous cerebrovascular disorder (e.g., cerebral infarction)
• Concurrent or previous severe ketosis, diabetic coma, or precoma
• Previous use of ASP1941