Study to Assess the Effect of Sodium Zirconium Cyclosilicate on the Pharmacokinetics of Tacrolimus and Cyclosporin in Healthy Subjects

This study will be an open-label, randomised sequence, 2-period, 2-cohort, 2-treatment in each cohort, cross-over study in healthy subjects (males and females of non-childbearing potential), performed at a single study centre.

The study will comprise: • A screening period of maximum 28 days; • Two treatment periods: − Treatment Period 1 starts with admission to the Clinical Unit on Day -1, followed by dosing on Day 1 with the assigned treatment (A, B, C, or D) as per assigned cohort and treatment sequence, followed by a washout period of at least 14 days. − Treatment Period 2 starts with admission to Clinical Unit on Day -1, followed by dosing on Day 1 with cross-over treatment as per assigned cohort, followed by a follow-up period of 7 to 10 days. • A follow-up visit/early termination visit at 7 to 10 days after the last investigation medicinal product (IMP) administration. Subjects will be assigned to either Cohort 1 (tacrolimus) or to Cohort 2 (cyclosporin). Each cohort will have 2 treatment periods. Subjects in each cohort will be randomly assigned to one of 2 treatment sequences (AB|BA or CD|DC) where, • Treatment A: Tacrolimus • Treatment B: Tacrolimus + SZC • Treatment C: Cyclosporin • Treatment D: Cyclosporin + SZC