The purpose of this study is to determine how well tolerated and safe AZD8566 is when given over 10 days, at different dose levels. This study will also determine how AZD8566 is distributed around the body and how it leaves the body.

Inclusion Criteria:

• Provision of written informed consent.
• Clinically normal physical findings and laboratory values as judged by the investigator with normal ECG
• Females who are permanently or surgically sterile or postmenopausal and males.

Exclusion Criteria:

• Intake of medicine (except Hormone Replacement Therapy or occasional paracetamol) within 3 weeks before first administration of study drug
• History of any convulsions or seizures
• History of infection or at risk of infection due to recent surgery or trauma
• History or presence of conditions known to interfere with the absorption, distribution, metabolism and excretion of the study drug