PA9159 is a highly potent novel corticosteroid. The purpose of this study is to exam the safety, tolerability, and pharmacokinetics of single and repeat dosing of Inhalation aerosol PA9159, to establish maximum tolerated dose in healthy chinese adult

This is a randomized, double-blind, placebo-controlled dose escalation phase 1 trial, including single dose and 7-day repeat doses of PA9159 Inhalation aerosol. In the first part of the study, the treatment is given once for one day, with escalation doses of 60 μg, 120 μg, 240 μg, 300 μg. 30 health subjects will be enrolled for this part. In the second part of the study, PA9159 at the escalation dose of 120 μg is given twice a day for 7 days. 10 health subjects will be enrolled for this group, randomized proportionally at 4:1 ratio to receive either the investigational product PA9159 Inhalation aerosol or placebo , with a total of 40 subjects for this two-part study. Subjects will be evaluated for the safety, tolerability and pharmacokinetics of PA9159 Inhalation aerosol.

Inclusion Criteria:

• Male and female subjects aged 18 to 65 years (including upper and lower limits);
• Male body weight ≥ 50 kg, female weight ≥ 45 kg, body mass index (BMI) between 19 and 26 kg/m2 (including cut-off values);
• Voluntary participation and signing of informed consent.

Exclusion Criteria:

• Those who cannot use the nebulizer correctly, cannot tolerate nebulized inhalation administration or have failed the training for inhalation administration;
• Those with special dietary requirements and cannot follow the unified diet;
• Those with a history of chronic diseases such as cardiovascular, digestive, endocrine, hematological, immune, and nervous system diseases; those with chronic diseases of the oral, pharyngeal, and respiratory systems; those with chronic diseases of the oral, pharyngeal, and respiratory systems at the time of screening; those with a history of recurrent (defined as more than 1 episode) or disseminated herpes zoster, repeated infection, tuberculosis infection, glaucoma, or cataract;
• Those who are allergic to the study drug or any component of the study drug, or have an allergic constitution (referring to an allergic constitution to more than two drugs and foods);
• Those whose vital signs, physical examination, laboratory tests, chest X-ray examination, 12-lead electrocardiogram examination, pulmonary ventilation function examination, etc. at the screening period are judged abnormal and have clinical significance;
• Those with positive tests for hepatitis B surface antigen (HBsAg), hepatitis C virus antibody (HCV Ab), Treponema pallidum antibody (Syphilis TP), human immunodeficiency virus (HIV Ag/Ab);
• Those with FEV1 ≤ 80% of predicted value or FVC ≤ 80% of predicted value at the screening period;
• Those who frequently drink alcohol within 3 months before screening, that is, those who drink more than 14 units of alcohol per week (1 unit = 360 mL of beer with 5% alcohol content or 45 mL of spirits with 40% alcohol content or 150 mL of wine with 12% alcohol content) or those with positive alcohol breath test at the screening period or those who cannot stop alcohol intake during the study period;
• Those with a smoking history of more than 10 years and smokers within 3 months before screening, or those who cannot stop using any tobacco products during the trial, or those with positive nicotine detection at the baseline period.
• Those who have a history of drug abuse or drug use within the past two years, or those whose urine screening for drug abuse is positive;
• Those who have taken any drugs (prescription drugs, over-the-counter drugs, Chinese herbal medicines, vaccines) or health supplements within the two weeks prior to screening or during the screening period;
• Those who have used any preparations containing glucocorticoid components or any drugs that affect the activity of CYP3A4 enzymes (such as ritonavir or ketoconazole, etc., as detailed in Appendix 5) within the 30 days prior to screening or during the screening period;
• Those who have consumed beverages or foods containing grapefruit, dragon fruit, mango, pomelo, pomegranate, papaya, or rambutan within 14 days prior to screening or during the screening period, or those who do not agree to stop consuming the above foods during the trial period;
• Those who have consumed any foods or beverages rich in caffeine, xanthine within 48 hours before the first use of the study drug (coffee, tea, cola, chocolate, seafood, animal liver, etc.), or those who do not agree to stop consuming the above foods during the trial period;
• Those who have donated blood or suffered significant blood loss within 90 days prior to screening or during the screening period (≥ 400 mL, except during the menstrual period of women) or have received blood products or undergone blood transfusion;
• Those who have participated in other clinical trials within 90 days prior to screening and have used the study product;
• Those who have undergone respiratory surgery in the past, or those who have undergone major surgery within 3 months prior to screening (judged by the investigator based on the previous medical history), suffered major trauma or planned to undergo surgery during the trial period;
• Those who have difficulty in venous blood collection, or have a known history of multiple fainting or hematemesis;
• Female subjects who have tested positive for pregnancy detection or are in lactation during the screening period or baseline period;
• Subjects who, in the opinion of the investigator, have other conditions that are not suitable for participating in the trial or who cannot participate in the trial due to their own reasons.