A Phase I Study to Evaluate the Pharmacokinetic Drug‒Drug Interaction of HP501, Febuxostat, and Colchicine in Male Chinese Patients with Hyperuricemia.

Background and Objective: HP501 is a highly selective renal urate transporter 1 (URAT1) inhibitor that is being developed for the treatment of hyperuricemia and gout. The primary aim of the present study was to study the pharmacokinetic drug‒drug interactions (DDIs) of HP501, febuxostat, and colchicine in hyperuricemic patients. Methods: Hyperuricemic patients were randomly divided into group A, receiving HP501 40 mg once daily on days 1 and 4–10, and group B, receiving febuxostat 40 mg once daily on day 1 and HP501 40 mg plus febuxostat 40 mg on days 4–10. All patients received 0.5 mg colchicine once daily from day 4 to 12. Blood samples were collected for measurement of drug concentrations and serum uric acid (sUA) levels. Results: Coadministration of colchicine with HP501 or HP501 plus febuxostat did not affect steady-state exposure to colchicine. Coadministration of HP501 and febuxostat did not significantly change the pharmacokinetic profiles of either drug. Following multiple administrations of HP501 40 mg once daily for 7 days, the maximal percent sUA change from baseline in group A was − 24.77%. The coadministration of HP501 40 mg and febuxostat 40 mg in group B for 7 days resulted in a − 55.82% maximal sUA reduction from baseline, and all patients achieved the goal of sUA < 360 μmol/L. All adverse events (AEs) were either mild or moderate, and the most frequently reported AEs were diarrhea and elevated alanine aminotransferase (ALT) levels. Conclusions: The concomitant use of HP501, febuxostat, and colchicine did not produce clinically meaningful DDIs in terms of their pharmacokinetic properties. Clinical Trial Registration: No. CTR20212261 (http://www.chinadrugtrials.org.cn/) registered September 2021. [ABSTRACT FROM AUTHOR]