First-In-Human (FIH), Single Ascending Dose (SAD) Study and Multiple Ascending Dose (MAD) Study of SP-101 Injection

Prior treatment

• Any febrile illness or active infection within 14 days prior to the first dose;
• Evidence of drug / substance abuse within the past 5 years, and/or habitual use of any drugs/substances, or a positive urine drug test at screening or baseline;
• Excessive consumption of nicotine products within 3 months prior to screening (average daily cigarette consumption \>5 cigarettes), or inability to stop using any tobacco products during the trial, or a positive nicotine test;
• Previous participation in this study; treatment with an investigational product within 30 days prior to study initiation; or planning participation in another clinical trial during the study period;
• Significant blood loss (≥200 mL) within 60 days prior to dosing（including trauma, blood sampling, blood donation, etc.）; or planning blood donation during the study or within 30 days post-dose;
• History of alcohol abuse, or average weekly alcohol consumption greater than 14 units within 3 months prior to screening or a positive alcohol breath test at baseline or inability to abstain from alcohol for the duration of the study;
• Excessive daily consumption of tea, coffee, and/or caffeine-rich beverages for a prolonged period within 3 months prior to screening; or intake of xanthine/caffeine-containing or grapefruit-containing foods or beverages (e.g., coffee, strong tea, chocolate, grapefruit) within 24 hours prior to the first intravenous infusion;
• Using any drugs that inhibit or induce the activity of hepatic drug-metabolizing enzymes within 30 days prior to screening;
• History of a major surgical procedure within the past 6 months prior to screening, or planned elective surgery during the course of the study;
• History of known or suspected hypersensitivity or allergic reaction to any component of the investigational product or to related compounds, drugs, or foods;

Other illness

• History of intolerance to IV infusion (e.g., severe pain) or unsuitable venous access (e.g., sclerotic, atrophic veins), difficulties with or contraindications to blood sampling; or a history of needle- or blood-injury-related phobia or syncope;
• Positive test result at screening for any of the following: hepatitis B surface antigen (HBsAg), antibody to hepatitis C virus (anti-HCV), antibody to human immunodeficiency virus (anti-HIV), or treponemal antibody for syphilis;
• Current or past history of psychiatric and/or , neurological diseases, and abnormalities of the motor or sensory systems, whether confirmed or suspected;
• Any clinically significant disease, or any clinically significant illness, condition, or other finding that, in the investigator's opinion, would pose a risk to subject safety or interfere with the conduct, progress, or completion of the study.;
• History or current presence of psychiatric disorders and/or brain dysfunction;
• Any other condition or reason that, in the opinion of the Investigator, would make the subject unsuitable for participation in the study.

Lab values

• Abnormal renal function (eGFR \< 90 mL/min/1.73 m²);
• History of QTc prolongation or demonstration of a clinically relevant ECG abnormality at screening;
• Any abnormal results during screening that is deemed clinically significant by the investigator, e.g., resting pulse \<55 or \>100 bpm; SBP ≥140 or \<90 mmHg; DBP ≥100 or \<60 mmHg, or ECG, or abnormal laboratory tests results, clinically relevant;
• Using any prescription drugs, OTC medications (excluding hormonal contraceptives, topically applied eye/nose drops and creams with no systemic exposure risk), Chinese herbal medicines, or food supplements such as vitamins and calcium supplements within 14 days prior to screening or during the screening period, unless prior approval has been obtained from the Investigator and Sponsor;

Other

• Individuals with special dietary requirements who cannot adhere to a unified diet (e.g., intolerance to standard meal foods, or those with dysphagia);
• Lactation or a positive pregnancy test at screening or baseline;
• History or current using of hallucinations, which is viewed unsuitable for by investigator;

• Willing and able to sign written informed consent;
• Aged 18 to 45 years old (inclusive), healthy males or females (male-to-female ratio is 1:1);
• Efficient contraceptive mean required by the protocol, and no plans for fertility, sperm donation or egg donation until 3 months after the last intravenous infusion;
• Body weight:≥50 kg (Male),≥45 kg (Female), Body Mass Index (BMI) of 18 to 28 kg/m2;
• Normal laboratory tests results, physical examination, medical history and surgical history review, 12-lead Electrocardiogram recording, and with no evidence of active and chronic diseases;
• willing and able to comply with all study procedures, restrictions, and visit schedules and to communicate effectively with the investigator;