To evaluate the relative bioavailability of ticagrelor for the different formulations. A randomized cross-over design has been chosen to minimize the effects of between-subject variability and any period effects on the overall results.

This study will be an open-label, randomized, 4-period, 4-treatment, cross-over, single-center, single-dose study to assess the relative bioavailability of different formulations of ticagrelor in approximately 44 healthy adult subjects. Eligible subjects will be healthy male and female aged 18 to 55 years, with a body weight of 55 to 100 kg and a body mass index (BMI) of 18 to 30 kg/m2. Of the 44 randomized subjects, at least 36 evaluable subjects should be at the end of the last treatment period. Subjects will be randomized to 1 of 4 treatment sequences and will receive single oral doses of 4 different formulations of ticagrelor under fasted conditions. Subjects will fast for at least 10 hours prior to administration of Investigational Medicinal Products (IMPs). No fluids will be allowed apart from water which can be given until 1 hour prior to administration of the IMP and then from 2 hours after administration of the IMP. A meal can be given 4 hours after administration of the IMP.

Inclusion Criteria:

1. Provision of signed and dated written informed consent prior to any study specific procedures.

2. Healthy male and female subjects aged 18 to 55 years with suitable veins for cannulation or repeated venipuncture.

3. Females must have a negative pregnancy test at Screening and on each admission to the Clinical Unit, must not be lactating and if of non child-bearing potential, confirmed at Screening by fulfilling one of the following criteria:

   - Postmenopausal defined as amenorrhea for at least 12 months or more following cessation of all exogenous hormonal treatments and follicle-stimulating hormone (FSH) levels in the post-menopausal range (> 40 milli international units per milliliter (mIU/mL)). - Documentation of irreversible surgical sterilization by hysterectomy, bilateral oophorectomy or bilateral salpingectomy but not tubal ligation. - Childbearing potential and are sexually active must use 1 highly effective method of birth control in combination with a barrier method, from the time of IMP administration until 3 months after the last dose of IMP.

4. Have a body mass index (BMI) between 18 and 30 kg/m2 inclusive and weigh at least 50 kg and no more than 100 kg inclusive.

5. Able to understand, read and speak the German language.

Exclusion Criteria:

1. History of any clinically significant disease or disorder which, in the opinion of the Investigator, may either put the potential subject at risk because of participation in the study, or influence the results or the potential subject's ability to participate in the study.
2. History or presence of gastrointestinal, hepatic or renal disease, or any other condition known to interfere with absorption, distribution, metabolism, or excretion of drugs.
3. Any clinically significant illness, medical/surgical procedure, or trauma within 4 weeks of the first administration of IMP.
4. Any clinically significant abnormalities in hematology, clinical chemistry, coagulation or urinalysis results at Screening or Day -1 of Treatment Period 1, as judged by the Investigator.
5. Any clinically significant abnormal findings in vital signs at Screening or Day -1 of Treatment Period 1, as judged by the Investigator.
6. Any clinically significant abnormalities on 12-lead ECG at Screening, as judged by the Investigator.
7. Any positive result on screening for serum hepatitis B surface antigen (HBsAg), hepatitis B core antibodies (anti-HBcAb), hepatitis C antibodies (anti- HCV) and human immunodeficiency virus (HIV) antibodies.
8. Has received a new chemical entity (defined as a compound which has not been approved for marketing) within 3 months of the first administration of IMP in this study. The period of exclusion begins 3 months after the final dose or 1 month after the last visit whichever is the longest.
9. Plasma donation within 1 month of Screening or any blood donation/loss more than 500 mL during the 3 months prior to Screening. 10. History of severe allergy/hypersensitivity or ongoing allergy/hypersensitivity, as judged by the Investigator, or history of hypersensitivity to drugs with a similar chemical structure or class to ticagrelor.

11. Current smokers or those who have smoked or used nicotine products within the previous 3 months.

12. Positive screen for drugs of abuse or cotinine (cotinine level above 500 ng/mL) at Screening or on each admission to the Clinical Unit or positive screen for alcohol on each admission to the Clinical Unit.

13. Use of drugs with enzyme-inducing properties such as St John's Wort within 3 weeks prior to the first administration of IMP.

14. Use of any prescribed or non-prescribed medication including antacids, analgesics (other than paracetamol/acetaminophen), herbal remedies, megadose vitamins (intake of 20 to 600 times the recommended daily dose) and minerals during 2 weeks prior to the first administration of IMP or longer if the medication has a long half-life.

15. Known or suspected history of alcohol or drug abuse or excessive intake of alcohol, as judged by the Investigator.

16. Involvement of any AstraZeneca or Clinical Unit employee or their close relatives.

17. Judgment by the Investigator that the potential subject should not participate in the study if they have any ongoing or recent (i.e., during the Screening period) minor medical complaints that may interfere with the interpretation of study data or are considered unlikely to comply with study procedures, restrictions and requirements.

18. Consumption of poppy seeds within 7 days of first admission to the Clinical Unit.

19. History of hemophilia, von Willebrand's disease, lupus anticoagulant, or other diseases/syndromes that can either alter or increase the propensity for bleeding. 20. A personal history of vascular abnormalities including aneurysms; a personal history of severe hemorrhage, hematemesis, melena, hemoptysis, severe epistaxis, severe thrombocytopenia, intracranial hemorrhage; or rectal bleeding within 1 year prior to Screening; or history suggestive of peptic ulcer disease; or at the discretion of the Investigator.

21. History of a clinically significant non-traumatic bleed or clinically significant bleeding risk, as judged by the Investigator.

22. Use of aspirin, ibuprofen, NSAIDs, or any other drug known to increase the propensity for bleeding for 2 weeks before randomization. 23. Platelet count less than 150 x 109/L.

24. Vulnerable subjects, e.g., kept in detention, protected adults under guardianship, trusteeship or committed to an institution by governmental or juridical order.

Healthy male and female subjects aged 18 to 55 years with suitable veins for cannulation or repeated venipuncture.