The purpose of this study is to assess safety and tolerability of AZD1656 after single ascending oral doses in Japanese healthy male subjects

Inclusion Criteria:

• Healthy Japanese males aged ≥20 and ≤40 years of age
• Clinically normal physical findings and laboratory values as judged by the investigator including negative test of Hepatitis B surface antigen, antibodies to HIV virus and antibodies to Hepatitis C virus

Exclusion Criteria:

• Clinically significant illness or clinically relevant trauma, as judged by the investigator, within two weeks before the first administration of the IP
• History of psychiatric or somatic disease/condition that may interfere with the objectives of the study, as judged by the investigator.