A Pharmacokinetic Study of Gecacitinib Hydrochloride Tablets in Healthy Adult Participants.

Inclusion Criteria: * 18≤ age ≤ 45, male or female; * Body weight: ≥50 kg for male, ≥45 kg for female; body mass index (BMI): 19.0-26.0 kg/m\^2 (inclusive); * Informed consent will be signed before the trial, and the content, process and possible adverse reactions of the study will be fully understood; * The volunteers should be able to communicate well with the researchers and understand and comply with the requirements of the study. Exclusion Criteria: * Participants who were enrolled in a clinical trial or used a study drug within 3 months before administration of the study drug. * Participants may not be able to complete the study for other reasons or have other reasons for not participating in the study as judged by the investigator.