Study of the Safety, Tolerability, and Pharmacokinetic Profile of Ascending Doses of Ingavirin Forte, Capsules, Folliwing Single and Subsequent Multiple Oral Administration in Healthy Volunteers

Inclusion Criteria:

1. Signed informed consent form by the healthy subject prior to any study activities.

2. Males and females aged 18 to 45 years (inclusive) of Caucasian race.

3. Verified "healthy" diagnosis (no abnormalities detected based on clinical,laboratory, and instrumental examination methods specified in the protocol).

4. Blood pressure (BP) levels: systolic blood pressure (SBP) from 100 to 130 mm Hg (inclusive), diastolic blood pressure (DBP) from 70 to 85 mm Hg (inclusive).

5. Heart rate (HR) from 60 to 89 beats per minute (inclusive).

6. Respiratory rate (RR) from 12 to 20 breaths per minute (inclusive).

7. Body temperature from 36.0°C to 36.9°C (inclusive).

8. Body mass index (BMI): 18.5 kg/m² ≤ BMI ≤ 30 kg/m², with a minimum body weight of ≥ 55 kg for men and ≥ 45 kg for women.

9. Agreement to use adequate contraceptive methods throughout the study and for 30 daysafter its completion; for women of childbearing potential - a negative urinepregnancy test result.

Non-inclusion criteria:

1. Known allergic history.

2. Hypersensitivity to imidazolylethylamide of pentanedioic acid andN,N'-bis-[2-(1,3-diazocyclopent-2,4-dien-4-yl)ethyl] diamide of malonic acid (XC9)and/or excipients included in the study drug in the medical history.

3. Drug intolerance to imidazolylethylamide of pentanedioic acid andN,N'-bis-[2-(1,3-diazocyclopent-2,4-dien-4-yl)ethyl] diamide of malonic acid (XC9)and/or excipients included in the study drug.

4. Lactose intolerance, lactase deficiency, glucose-galactose malabsorption.

5. Evidence or history of chronic diseases of the kidneys, liver, gastrointestinaltract (GIT), cardiovascular, lymphatic, respiratory, nervous, endocrine,musculoskeletal, urogenital, and immune systems, as well as skin, hematopoietic andvision organs.

6. History of GIT surgery (except for appendectomy at least 1 year prior to screening).

7. Diseases/conditions that, in the judgment of the investigator, may affect theabsorption, distribution, metabolism, or excretion of the study drug (SD).

8. Acute infectious diseases less than 4 weeks before screening.

9. Use of drugs that significantly affect hemodynamics, drugs affecting liver function (barbiturates, omeprazole, cimetidine, etc.), drugs that prolong the QT interval (antipsychotics (haloperidol, quetiapine, olanzapine, risperidone, sulpiride),antidepressants (fluoxetine, sertraline), antiarrhythmics (amiodarone), antibiotics (clarithromycin, azithromycin, moxifloxacin, levofloxacin, ciprofloxacin),antifungals (fluconazole), diuretics (furosemide)), less than 2 months beforescreening.

10. Regular use of drugs less than 2 weeks before screening and single use of drugs lessthan 7 days before screening (including over-the-counter drugs, vitamins, dietarysupplements, herbal medicines).

11. Blood or plasma donation within 3 months before screening.

12. Use of hormonal contraceptives (in women) within 2 months before the start ofscreening.

13. Use of depot injections of any drugs less than 3 months before the start ofscreening.

14. Pregnancy or lactation; positive urine pregnancy test for women of childbearingpotential.

15. Women of childbearing potential who have had unprotected sexual intercourse within 30 days prior to taking study medications with an unsterilized partner.

16. Participation in another clinical trial less than 3 months prior to screening orconcurrently with this study.

17. Consumption of more than 10 units of alcohol per week in the last month beforeinclusion in the study or a history of alcoholism, drug addiction, or substanceabuse.

18. Smoking more than 10 cigarettes per day currently or having smoked that amount inthe past 6 months prior to screening; unwillingness to refrain from smoking duringtheir stay at the research center.

19. Consumption of alcohol, caffeine, and xanthine-containing products within 7 daysprior to taking the study drug.

20. Consumption of citrus fruits, cranberries, rose hips and products containing them,preparations or products containing St. John's wort within 7 days prior to takingthe study drug.

21. Dehydration due to diarrhea, vomiting or other causes within the last 24 hoursbefore taking the study drug.

22. Positive blood test to human immunodeficiency virus (HIV) types 1 and 2; antibodiesto Treponema pallidum antigens; surface antigen of hepatitis B virus (HBsAg);antibodies to hepatitis C virus antigens at screening.

23. Clinically significant deviations on electrocardiogram (ECG) in medical historyand/or at screening including: QTcF interval (corrected by Fredericia) ≥430 ms inmen and ≥450 ms in women.

24. Information on risk factors for developing torsades de pointes such as heartfailure, hypokalemia, family history of prolonged QT syndrome.

25. Positive urine test for narcotic substances and potent medications at screening.

26. Positive test for alcohol vapors at screening.

27. Planning hospitalization during the study period for any reason other thanhospitalization provided for by this protocol.

28. Inability or unwillingness to comply with protocol requirements, perform proceduresprescribed by the protocol, adhere to dietary and activity regimens.

29. Belonging to a vulnerable group of volunteers: students from higher and secondarymedical, pharmaceutical and dental educational institutions; junior staff fromclinics and laboratories; employees of pharmaceutical companies; military personneland prisoners; individuals in nursing homes; low-income and unemployed individuals;representatives of national minorities; homeless individuals; refugees; individualsunder guardianship or custody; individuals unable to give consent; as well as lawenforcement officers.

30. Other conditions that, in the judgment of the investigator, may interfere withparticipation in the study or may lead to early withdrawal of the volunteerincluding adherence to fasting or special diets (e.g., vegetarianism, veganism, saltrestriction) or a special lifestyle (night work hours, extreme physical exertion).

Exclusion Criteria:

1. The volunteer's withdrawal from further participation in the study.

2. Non-compliance by the volunteer with the study participation rules (missed studyprocedures, self-administration of prohibited medications, violation of dietary andlifestyle restrictions, etc.).

3. The emergence of reasons/situations during the study that threaten the safety of thevolunteer (e.g., hypersensitivity reactions, etc.).

4. Volunteers selected for participation in the study who do not meetinclusion/exclusion criteria.

5. Development of a severe adverse event (SAE) and/or serious adverse reaction (SAR) inthe volunteer during the study.

6. The volunteer requires or undergoes treatment that may affect the pharmacokineticsof the study drug.

7. Missing two or more consecutive blood samples or three or more blood samples duringone study period.

8. The occurrence of vomiting/diarrhea within 8 hours after taking the study drug.

9. Positive urine test for narcotic substances and potent medications.

10. Positive test for alcohol vapors.

11. Positive pregnancy test in female participants.

12. The emergence of other reasons during the study that prevent the conduct of thestudy according to the protocol.