Efficacy and Safety of AG2001 in Patients With Acute Bronchitis

Inclusion Criteria: 1. Adults aged ≥19 years to \<65 years old 2. Subjects who present symptoms of Acute Bronchitis with cough and sputum symptoms within 48 hours prior the randomization visit(Visit 2) who satisfy the following * Total Bronchitis Severity Scale ≥ 5 * Total Bronchitis Severity Scale sputum score ≥ 2 3. Subjects who without fever(condensed body temperature standard: less than 38.5°C) prior to randomization visit(Visit 2) 4. Subjects who present symptoms of Acute Bronchitis with cough less then 2 weeks prior to randomization visit(Visit 2) 5. Written consent voluntarily to participate who can understand the information provided in this clinical trial Exclusion Criteria: * Chronic respiratory diseases (e.g., COPD, asthma, pneumonia, tuberculosis, lung cancer) * Clinically significant hepatic, renal, cardiovascular, or neurological disorders * Use of prohibited medications (e.g., antibiotics, antivirals, corticosteroids) within the washout period * Positive test for hepatitis B, hepatitis C, or HIV * Pregnant or breastfeeding women * Any condition deemed inappropriate by the investigator