A double-blind, randomized, placebo-controlled, Phase I clinical study of the safety and tolerability of increasing doses of Treamid after single and repeated oral administration in healthy volunteers. The volunteers received the study drug once, and then continued daily intake for 14 days after a 6-day break. The primary objective of the study was to evaluate the safety and tolerability profile of Treamid after single and multiple administration based on the frequency and severity of adverse events and changes in vital signs, laboratory results, electrocardiography and results of the physical examination. The secondary objective of the study was to assess pharmacokinetics of active pharmaceutical substance of Treamid.

1 Russian center was approved for participation in this study and was initiated. Healthy volunteers were enrolled in 1 center. The study consisted of 4 periods: screening, single administration, multiple administration and follow-up.

All eligible subjects were randomized into the study in appropriate cohort groups sequentially. Cohort 1 - Treamid or Placebo 5 mg once and then daily 14 days after a 6-day break; Cohort 2 - Treamid or Placebo 15 mg once and then daily during 14 days after a 6-day break; Cohort 3 - Treamid or Placebo 50 mg once and then daily during 14 days after a 6-day break. The decision regarding increasing of the study drug dose for a subsequent cohort was made by the Data Safety Monitoring Committee on the basis of preliminary safety results assessment. A total of 16 volunteers received Treamid (4 - 5 mg, 4 -15 mg, 8 - 50 mg) and a total of 4 volunteers received the placebo during the study participation. The follow-up period lasted for 4 weeks.

Inclusion Criteria:

1. Non-smoking male at the age from 18 to 50 years old (inclusive);
2. Verified diagnosis "healthy" according to standard clinical, laboratory and instrumental methods of examination;
3. Body mass index from 18.5 to 30 kg/m2 (inclusive);
4. Agreement to use adequate contraception methods during the study and 3 months after its completion (condoms with spermicide);
5. Signed patient explanation sheet and informed consent for participation in the study.

Exclusion Criteria:

1. Chronic diseases of the cardiovascular, bronchopulmonary, neuroendocrine systems and diseases of the gastrointestinal tract, liver, kidneys, blood;
2. Laboratory deviations from normal values at screening (the deviations will not include single violations of reference ranges of laboratory parameter if they are not accompanied with any clinical symptoms, do not require additional examination or treatment and are not confirmed by values of related laboratory parameters);
3. Regular administration of drugs in less than 2 weeks before starting the study; administration of drugs effecting on hemodynamics, liver function, and others. (barbiturates, omeprazole, cimetidine, etc.) in less than 30 days before starting the study;
4. Antibodies to HIV and hepatitis C, hepatitis B surface antigen, positive test for syphilis;
5. Unstable sleep architecture (e.g. night work, sleep disorders, insomnia, recently returned from another time zone, etc.);
6. Signs of alcohol or drug addiction; taking alcohol or narcotic drugs during 4 days prior to screening (taking more than 10 units of alcohol per week (1 unit of alcohol is equivalent ½ liters of beer, 200 ml of wine or 50 ml of hard alcoholic beverages);
7. Medical history significant for allergic (including drug intolerance and food allergies);
8. Symptomatic rhinitis in past medical history during 2 years before screening (allergic rhinitis, non-allergic rhinitis or allergic coryza);
9. Blood/plasma donation (from 450 ml) in less than 2 months prior to screening;
10. Surgeries in hospital environment (except appendectomy) during 12 weeks prior to screening;
11. Participation in other clinical studies or taking other investigated drugs during 3 months prior to screening;
12. Inability to understand or comply with the protocol procedures;
13. Acute infectious diseases in less than 4 weeks prior to screening.

Blinding was carried out by using Placebo equivalent to Treamid tablets without active substance and the corresponding labeling of the study drug.