A Bioequivalence Study Between Two Brands of Medications to Treat Cough & Cold Symptoms

Inclusion Criteria: 1. Subjects being verified as "Healthy": "Healthy" is defined as absence of any diseases or abnormalities on the basis of physical examination, standard clinical laboratory, and instrumental examinations performed at the screening visit. 2. Females of childbearing potential must have a negative urine pregnancy test at the baseline visit. 3. Male or non-pregnant, non-lactating female agree to the contraceptive requirements (including female partner's use of a highly effective method of birth control for at least 3 months before the study, during the study, and for 30 days after the last dose of study drug) as outlined in Section 11.6 (Note: Female subjects are not permitted to use hormonal contraceptives as per exclusion criterion 7). 4. Body Mass Index (BMI) between 18.5 and 30.0 kg/m2, inclusive, and a total body weight of at least 50.0 kg. 5. Volunteers who agree to abstain from alcohol consumption for at least 48 hours prior to dosing and until the last blood sample collection of each study period. Exclusion Criteria: 1. Use of medications, including prescription medication, over-the-counter medication including vitamins, herbal supplements, medicinal plants (e.g., supplements containing garlic extract), and topical preparations of drugs that are systemically absorbed (e.g., steroids and non-steroid anti-inflammatory drugs) within two weeks prior to dosing. 2. Use of St. John's wort (Hypericum perforatum) within 30 days prior to dosing. 3. Depot injection or an implant of any drug within 3 months prior to dosing. 4. Abnormal results of laboratory and instrumental methods of examinations, including electrocardiogram (ECG). 5. Is hypersensitive, intolerant, or has experienced an allergic reaction to the active ingredients or excipients of drug products that will be used for the study, or has had severe allergy (e.g., anaphylaxis, angioedema) in the past. 6. Females with a positive pregnancy test and/or are breast-feeding. 7. Females, currently using hormonal contraceptives (including use less than 2 months prior to enrollment). 8. Males with a pregnant spouse or partner or males who are not willing to prevent conception in a spouse or partner. 9. History of regular alcohol consumption in the 6 months before screening, exceeding weekly limits of 10 alcohol units (2 L of wine or 5 L of beer or 0.5 L of spirits) or presence of information on alcoholism, substance, or drug abuse in medical history. 10. Alcohol consumption within 48 hours prior to dosing, positive respiratory alcohol test at screening, or inability to abstain from alcohol consumption until the last blood sample collection of each study period. 11. Volunteers who smoke more than 10 cigarettes per day or have an uncontrollable habit of chewing or inhaling nicotine products. 12. Drug addiction in history, or a positive urine test for psychoactive or narcotic substances. 13. Use of caffeine products exceeding 500 mg caffeine daily (5 cups of coffee) and the inability to abstain from caffeine products within 48 hours before dosing and prior to the last blood sample collection of each study period. 14. Use of xanthine containing products (e.g., coffee, tea, chocolate, or cola drink) within 48 hours before dosing and prior to the last blood sample collection of each study period. 15. Ingestion of food or beverages containing grapefruit, Chinese grapefruit (pomelo), or Seville oranges (including marmalade) within 10 days prior to the first dose of the investigational product and inability to stop taking these products during the study. 16. Positive test for human immunodeficiency virus (HIV) 1 or 2 antibodies, hepatitis B surface antigen (HBsAg), or hepatitis C antibodies (anti-HCV) or syphilis (RW). 17. Heart rate \<60 or \>90 per minute at rest, or systolic blood pressure \<100 or \>130 mm Hg, or diastolic blood pressure \<70 or \>90 mm Hg. 18. Clinically significant signs and symptoms or history of respiratory, cardiovascular, gastrointestinal, dermatological, neurological, psychiatric, genitourinary, endocrinological, musculoskeletal, eye, ear, nose and throat disease, liver disorders, severe chronic kidney disease, active gastric or duodenal ulcer, benign prostate hyperplasia, phenylketonuria, hypertension, hyperthyroidism, diabetes, heart disease, aortic stenosis, tachyarrhythmia, glaucoma or phaeochromocytoma. 19. Hereditary problems of glucose-galactose malabsorption, fructose intolerance, or sucrose/isomaltase deficiency. 20. History of gastrointestinal surgery other than appendectomy. 21. Medical or surgical conditions, which might significantly interfere with the functioning of gastrointestinal tract, blood-forming organs etc.