This study is a randomized, double-blind, placebo-controlled, single-center, phase I study to evaluate the safety, tolerability, and pharmacokinetics of AK3280 in healthy Chinese subjects.

This phase I study is a randomized, double-blind, placebo-controlled, single-center clinical study in healthy subjects. The objectives of the study are to evaluate the safety, tolerability, and pharmacokinetics of AK3280. Approximately, 36 healthy Chinese subjects will be recruited and randomized to orally receive AK3280 or matching placebo. The total duration of the study will be approximately 25 days for each subject.

Inclusion Criteria:

• Participants who are willing to sign and date informed consent forms.
• Male or female participants between 18 and 45 years of age, inclusive.
• Have a bodyweight ≥50.0 kg (Male) or ≥45.0 kg (Female), and a body mass index (BMI) between 19.0 and 28.0 kg/m^2, inclusive.
• Participants are in good health without any significant clinical abnormalities on the basis of medical history related to heart, liver, kidneys, gastrointestinal tracts, or mental, central nervous, and metabolic disorders; physical examination (including vital signs); baseline laboratory test and 12-lead electrocardiogram (ECG) results.
• Participants (including male participants) who have no pregnancy plan and are willing to use an effective method of contraception during the screening period and for three months thereafter without sperm or egg donation plans.
• Participants who are capable to communicate with investigators and comply with the study requirements.

Exclusion Criteria:

• Allergic to any of the study drug ingredients or ineligible determined by the investigator due to a history of food or drug allergies.
• Having an abnormal medical history in terms of clinically significant digestive, urological, neurological, hematological, endocrine, oncological, pulmonary, immunological, cardiovascular, or psychiatric diseases or having histories of use any prescription, over-the-counter, herbs, vitamins, or vaccines within four weeks prior to study drug administration.
• Intolerant to venipuncture or having difficulty in venous blood collection.
• Having a personal history of drug and alcohol abuse, use of nicotine-containing products, receiving caffeine-containing drinks, taking grapefruit or food made of it, and medications, food, or beverages such as xanthines that could affect the ADME of study medication.
• Having clinically significant abnormalities in vital sign measures and lab test results.
• Female subjects are lactating at screening.
• Previous participation in any clinical trial within 3 months prior to screening.
• Inability to meet the study requirements in the opinion of the investigator.