1. Incidence of Adverse Events-AE (Occurrence of AE (yes, no); Name of AE (adverse event description); Duration of AE (start time, end time); Intensity of AE (mild, moderate, severe, life-threatening, death); Severity of AE (serious, non-serious); Causal relationship (definitive, probable, possible, unrelated/doubtful, conditional/unclassified, non-evaluable/unclassifiable); Conduct to AE (none, temporary interruption, permanent interruption, pharmacological treatment, non-pharmacological treatment); Outcome (recovered, improved, persists, sequelae)). Measurement time: During the period after administration and up to 14 days after the last dose.
2. Tolerability assessment (Evaluation will include: Death (yes, no); AEs leading to discontinuation or interruption of treatment (yes, no); AEs requiring concomitant treatment (yes, no); AEs requiring hospitalization of the subject (yes, no)). Measurement time: During treatment and up to 14 days after the last dose.
3. Clinical laboratory tests (The percentage of volunteers with variations outside the reference range for hematological and biochemical parameters will be measured). Measurement time: Stage I: At baseline and at 14 days. Stage II: At baseline and at days 21 and 35.
4. Vital signs (The percentage of volunteers with variations outside the reference range for systolic blood pressure, diastolic blood pressure, heart rate, respiratory rate, and temperature will be measured). Measurement time: In Stage I: At baseline (within 60 minutes before administration) and at 0.5, 1, 2, 3, 4, 6, 8, 10, 12, and 24 hours after administration; every 8 hours on days 1 through 6; on day 7 before hospital discharge; and on day 14 at the final visit. Stage II: At baseline (within 60 minutes before administration) and at 0.5, 1, 2, 3, 4, 6, 8, 10, 12, and 24 hours after administration; every 8 hours on days 1 through 21; on day 22 before hospital discharge, and on day 35 at the final visit.
5. Electrocardiogram (The percentage of volunteers with abnormalities will be measured). Measurement time: Stage I: At baseline and at 2, 4, 8, and 12 hours post-administration, on days 1, 2, 3, 4, 6, 7, and 14 in the morning. Stage II: At baseline and at 2, 4, and 8 hours after the first dose of the day and 2 hours after the second dose; on days 1, 2, 3, 4, 5, 6, 7, 14, and 21 in the morning before the first dose of the day and at 2 hours after each administration and on day 35.
6. Abdominal ultrasound (The percentage of volunteers with liver abnormalities will be measured). Measurement time: Stage I: At baseline and on days 7 and 14. Stage II: At baseline and on days 7, 14, 21, and 35.
7. Cognitive Impairment (The percentage of volunteers with cognitive deficits will be measured using the Mini-Mental State Examination (MMSE) questionnaire). Measurement time: Stage I: At baseline (within 60 minutes before administration), 4 and 24 hours after administration. Stage II: At baseline (within 60 minutes before administration) and 4 hours after administration of the first dose of the day. On days 1, 3, 5, 7, 14, and 21, 4 hours after the first dose of the day, and on day 35.
8. Glasgow Coma Scale (Assessment of the level of consciousness by assessing eye opening, verbal response, and motor response. The percentage of volunteers with altered levels of consciousness will be measured.) Measurement time: Stage I: Daily during hospitalization and on day 14. Stage II: Daily during hospitalization and on days 21 and 35.
9. Concomitant treatment (The name of the concomitant medication and the treatment regimen will be recorded.) Measurement time: Stage I: Daily during hospitalization and on day 14. Stage II: Daily during hospitalization and on days 21 and 35.