A Clinical Study to Evaluate the Safety, Tolerability and Pharmacokinetic Profile of TQC3302 Inhalation Spray in Healthy Adult Subjects

This is an early-phase safety study testing a new inhaled medication called TQC3302 in healthy adult volunteers. The goal is to understand how the body absorbs, processes, and tolerates this drug when inhaled. No disease treatment is involved — researchers want to establish safety data in healthy people first. **You may be eligible if...** - You are a healthy adult between 18 and 55 years old - You weigh at least 50 kg (if male) or 45 kg (if female) with a BMI in the healthy range - You can successfully use an inhaler device after training - Your lung function tests are normal - You and your partner agree to use effective contraception during the study and for 90 days after the last dose **You may NOT be eligible if...** - You have a history of glaucoma, benign prostate enlargement, urinary obstruction, or chronic constipation - You have active tuberculosis, bronchiectasis, or other lung diseases - You have any drug allergies or significant health conditions - You have had surgery in the past month or plan surgery during the study - You have hepatitis B, hepatitis C, HIV, or syphilis - You are pregnant or breastfeeding - You use tobacco, recreational drugs, or alcohol excessively Talk to your doctor to see if this trial is right for you.