A Study to Assess the Effect of Verinurad on the Electric Activity of the Heart

This study will be conducted to investigate the safety of verinurad in healthy volunteers in combination with allopurinol 300 mg, compared with placebo in particular its effect on electrocardiogram (ECG), with focus on the QT/QTc interval

This study will be conducted as a single-centre, randomised, placebo-controlled, double-blind, 3-period, crossover study to assess the effect on the QTcF interval of a single oral dose of verinurad 24 mg extended release (ER8) formulation (therapeutic exposure) or verinurad 40 mg immediate release (IR) formulation (supra-therapeutic exposure), each in combination with allopurinol 300 mg, compared to placebo in healthy subjects.

There are 3 study treatments:

* Treatment A: Verinurad 24 mg ER8 formulation co-administered with 300 mg allopurinol
* Treatment B: Verinurad 40 mg IR formulation co-administered with 300 mg allopurinol
* Treatment C: Matched placebos for both verinurad and allopurinol

All subjects will receive a single dose of all 3 treatments (A, B, and C) in a cross-over design with wash-out periods of at least 7 days between each study dose administration.

Subjects will be randomised to the treatment sequence (ABC, BCA, CAB, etc.) using William's Latin square. The treatments will be administered in a double-blind manner after an overnight fast of at least 10 hours.

The study will comprise the following periods (visits):

* Screening Period of maximum 28 days (Visit 1);
* Three treatment periods of 3 days each, during which subjects will be resident at the study centre from the morning of the day before administration of the study dose until discharge 2 days after study dose administration (Visits 2 to 4);
* Wash-out periods of at least 7 days between each study dose administration;
* Final visit within 7 to 10 days after the last study dose administration (Visit 5).

Each subject will be involved in the study for approximately 53 days and have 5 study visits.

Eligibility Criteria:
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 50 years (inclusive) with suitable veins for cannulation or repeated venipuncture.
3. Females must have a negative pregnancy test at Screening and on admission to the study centre must be:

(1) Not pregnant or currently lactating or breast-feeding. (2) Of non-childbearing potential confirmed at the Screening Visit by fulfilling one of the following criteria: (i) Post-menopausal 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 (FSH \>40 IU/mL).

(ii) Documentation of irreversible surgical sterilization by hysterectomy, bilateral oophorectomy or bilateral salpingectomy but not tubal ligation.

(3) OR, if of childbearing potential, must be willing to use an acceptable method of contraception to avoid pregnancy for the entire study period and 3 months after the Follow-up Visit.

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. Serum uric acid (sUA) \<300 μmol/L at Screening (Visit 1) and sUA \<330 μmol/L on Day -1 in every treatment period (Visit 2 to 4). Note: Since sUA levels might vary on a daily basis, subjects with sUA ≥330 μmol/L on Day -1 will be retested. Treatment on Day 1 will only be administered when the sUA level on Day -1 is \<330 μmol/L upon retesting. Subjects with sUA ≥330 μmol/L despite retesting, may conduct the treatment period at a later date when they have sUA \<330 μmol/L.

6. Must be able to swallow multiple capsules/tablets.

Exclusion criteria:

1. History of any clinically significant disease or disorder which, in the opinion of the Investigator, may either put the subject at risk because of participation in the study, or influence the results or the subject's ability to participate in the study.
2. History or presence of gastrointestinal (GI), 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 investigational medicinal product (IMP).
4. Subject has a positive test result for SARS-CoV-2 RT-PCR before randomisation.
5. Subject has clinical signs and symptoms consistent with COVID-19, eg, fever, dry cough, dyspnoea, sore throat, fatigue or confirmed infection by appropriate laboratory test within the last 4 weeks prior to screening or on admission.
6. History of severe COVID-19 (hospitalization, extracorporeal membrane oxygenation, mechanically ventilated).
7. Any clinically significant abnormalities in clinical chemistry, haematology, or urinalysis results, at Screening (Visit 1) as judged by the Investigator, including:

(1) Alanine aminotransferase (ALT) \>1.5 × upper limit of normal (ULN) (2) Aspartate aminotransferase (AST) \>1.5 × ULN (3) Bilirubin (total) \>1.5 × ULN (4) Gamma glutamyl transpeptidase (GGT) \>1.5 × ULN 8. Any clinically significant abnormal findings in vital signs at Screening as judged by the Investigator, including:

(1) Systolic blood pressure \<90 mmHg or \>140 mmHg (2) Diastolic blood pressure \<50 mmHg or \>90 mmHg (3) Heart rate \<50 or \>90 bpm 9. Carrier of the HLA-B\*58:01 allele. 10. Any clinically important abnormalities in rhythm, conduction or morphology of the 12 lead safety ECG and any clinically important abnormalities in the 12-lead safety ECG as considered by the Investigator that may interfere with the interpretation of QT interval corrected for heart rate using Fridericia's formula (QTcF), including abnormal ST T wave morphology, particularly in the Clinical Study Protocol (CSP)-defined primary lead for dECG analysis or left ventricular hypertrophy:

1. Prolonged QTcF \>450 ms or shortened QTcF \<340 ms or family history of long QT syndrome.
2. PR (PQ) interval shortening \<120 ms (PR \>110 ms but \<120 ms is acceptable if there is no evidence of ventricular pre-excitation).
3. PR (PQ) interval prolongation (\>220 ms) intermittent second (Wenckebach block while asleep is not exclusive) or third degree atrioventricular (AV) block, or AV dissociation.
4. Persistent or intermittent complete bundle branch block, incomplete bundle branch block, or intraventricular conduction delay with QRS \>110 ms. Subjects with QRS \>110 ms but \<115 ms are acceptable if there is no evidence of ventricular hypertrophy or pre-excitation.

11. Any positive result on Screening for serum hepatitis B surface antigen OR anti-HBc antibody, hepatitis C antibody, and human immunodeficiency virus (HIV) antibody.

12. Suspected or known Gilbert's syndrome. 13. Current smokers or those who have smoked or used nicotine products (including e cigarettes) within the 3 months prior to Screening.

14. Known or suspected history of alcohol abuse or excessive intake of alcohol as judged by the Investigator. Excessive intake of alcohol defined as the regular consumption of more than 24 g of alcohol per day for men or 12 g per day for women.

15. Positive screen for drugs of abuse, cotinine (nicotine) or alcohol at the Screening Visit or on each admission to the study centre.

16. Excessive intake of caffeine-containing drinks or food (eg, coffee, tea, chocolate) as judged by the Investigator. Excessive intake of caffeine defined as the regular consumption of more than 600 mg of caffeine per day (eg, \>5 cups of coffee) or would likely be unable to refrain from the use of caffeine-containing beverages during confinement at the study site.

17. Previous hypersensitivity reaction to allopurinol or any URAT1 inhibitor. 18. Subjects who are pregnant, breast-feeding or planning to become pregnant (pregnancy is to be avoided for the entire study period and 3 months after the Follow up Visit).

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

20. Use of any prescribed or non-prescribed medication including antacids, analgesics (other than paracetamol/acetaminophen), herbal remedies, megadose vitamins (intake of 20 to 600 × the recommended daily dose) and minerals during the 2 weeks prior to the first administration of IMP or within 5 half-lives (whichever is longer). Hormone replacement therapy is allowed for females.

21. Plasma donation within 1 month of Screening or any blood donation/blood loss \>500 mL during the 3 months prior to Screening.

22. Has received another new chemical or biological entity (defined as a compound which has not been approved for marketing in the US) within 30 days or within 5 half lives (whichever is longer) of the first administration of IMP in this study.

Note: Subjects consented and screened, but not randomised in this study or a previous Phase I study, are not excluded.

23. Involvement of any AstraZeneca, Parexel or study site employee or their close relatives.

24. Subjects who have previously received verinurad. 25. Subjects who cannot communicate reliably with the Investigator and/or are not able to read, speak and understand the German language.

26. Judgment by the Investigator that the subject should not participate in the study if there are any ongoing or recent (ie, during the Screening Period) minor medical complaints that may interfere with the interpretation of the study data or are considered unlikely to comply with study procedures, restrictions and requirements.

27. Subjects who are vegans or have medical dietary restrictions. 28. Vulnerable subjects, eg, kept in detention, protected adults under guardianship, trusteeship, or committed to an institution by governmental or juridical order.

29. Subjects who are regularly exposed to COVID-19 (eg, health care professionals working in COVID-19 wards or at emergency departments) as part of their daily life.