Safety, Tolerability, and Pharmacokinetic Parameters of Increasing Doses of Ingavirin Forte, Capsules, During Single and Subsequent Multiple Oral Administration in Healthy Volunteers

Inclusion Criteria:

1. A voluntarily and personally signed informed consent form by a healthy volunteer toparticipate in the study prior to any study procedures being conducted.

2. Men and women aged 18 to 45 years (inclusive) of Caucasian race.

3. Verified diagnosis of "healthy" (absence of deviations 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 with preserved reproductive potential, a negativeresult on a urine pregnancy test is required.

Non-inclusion criteria:

1. 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 in the medical history.

4. Hereditary galactose intolerance, lactase deficiency, or glucose-galactosemalabsorption in the medical history.

5. Chronic diseases of the kidneys, liver, gastrointestinal tract (GIT),cardiovascular, lymphatic, respiratory, nervous, endocrine, musculoskeletal,urogenital, and immune systems, as well as skin, hematopoietic organs, and the eye.

6. Surgical interventions on the GIT in the medical history (except for appendectomy atleast 1 year prior to screening).

7. Diseases/conditions that, in the investigator's opinion, may affect the absorption,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. Donating blood or plasma less than 3 months before screening.

12. Use of hormonal contraceptives (in women) less than 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 result for women withpreserved reproductive potential.

15. Women with preserved reproductive potential who have had unprotected sexualintercourse within 30 days prior to taking study medications with an unsterilizedpartner.

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 results for antibodies to human immunodeficiency virus (HIV)types 1 and 2; antibodies to Treponema pallidum antigens; surface antigen ofhepatitis 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 breath alcohol test 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 investigator's opinion prevent volunteer inclusion inthe study or may lead to early withdrawal from the study including adherence tofasting or special diets (e.g., vegetarianism, veganism, salt restriction) or aspecial 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 breath alcohol test result.

11. Positive pregnancy test result in women.

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