This First-in-human (FIH) study will evaluate the safety, tolerability, and pharmacokinetics of the tau self-association inhibitor, OLX-07010 in single ascending doses (SAD) and multiple ascending doses (MAD) in healthy adults (18-50 of age inclusive), and single dose in healthy elderly (51-75 of age inclusive). The effects of dosing with or without food in healthy adults will also be studied (optional).

This FIH Phase 1 randomized, double-blind, four-part study will be conducted to evaluate the safety, tolerability, and PK of the tau self-association inhibitor, OLX-07010 in single ascending doses, multiple ascending doses in healthy adult participants, and as a single dose in healthy elderly participants. There is an option for an additional part to evaluate the effects of food (fed and fasted) on OLX-07010 in healthy adult participants. This study will be divided into 4 parts: Part 1-Randomized Double-Blind Single Ascending Dose in Healthy Adult Participants; Part 2-Randomized Double-Blind Multiple Ascending Dose in Healthy Adults Participants; Part 3-Randomized Double-Blind Single Dose in Healthy Elderly Participants; and Part 4 (Optional)-Food Effect (Single Cohort, 2 Sequence, 2 Period Crossover Fed and Fasted) in Healthy Adult Participants.

Inclusion Criteria:

• Participant voluntarily agrees to participate and signs an approved informed consent prior to performing any of the Screening Visit procedures.
• Participant must be a healthy male or female of non-childbearing potential 18 to 50 years old inclusive, in Part 1, 2, and 4 of the study. Participant must be a healthy elderly male or female of non-childbearing potential 51-75 years old inclusive in Part 3 of the study.
• Male participants with body weight ≥ 55 kg; and females with body weight ≥ 50 kg and body mass index (BMI) between 18 and 30 kg/m2 (inclusive) for Part 1, 2, and 4 of the study; and BMI between 18 and 32 kg/m2 (inclusive) for Part 3 of the study.
• Female participants must be of non-childbearing potential (surgically sterile [hysterectomy or bilateral tubal ligation] or postmenopausal ≥ 1 year with follicle -stimulating hormone [FSH] > 40 IU/L at screening).

Exclusion Criteria:

• Participant has clinically significant history or evidence of cardiovascular (CV), respiratory, hepatic, renal, gastrointestinal, endocrine, neurological, immunological, or psychiatric disorder(s).
• Participant has any disorder that would interfere with the absorption, distribution, metabolism or excretion of drugs.
• Participant has a history of hypersensitivity to the study drug or any of the excipients or to medicinal products with similar chemical structures.
• Treatment with any investigational drug within the past 30 days prior to dosing.
• Use of any prescription drugs, herbal supplements, within 30 days prior to initial dosing, and over the counter (OTC) medication, dietary supplements (vitamins included) within 2 weeks prior to initial dosing. For elderly population in Part 3, allowed medications must be stable for at least 1 month.
• Clinically significant vital signs or ECG abnormality at screening and at baseline.
• Score of "yes" on specific items of the Suicidal Ideation section of the C-SSRS at the Screening Visit.
• History of any cancer within 5 years of screening (more than 10 years in remission).
• Any history of renal injury/kidney disease or presence of impaired renal function as indicated by clinically significantly abnormal creatinine or blood urea nitrogen (BUN) values in blood, or clinically relevant abnormal urinary constituents at Screening or Admission.
• Participant has any of the liver enzymes (aspartate aminotransferase [AST], alanine aminotransferase [ALT], alkaline phosphatase [ALP], gamma glutamyl transferase [GGT]) or total bilirubin [TBL]) greater than the upper limit of normal (ULN), with the exception of isolated TBL elevation consistent with Gilbert's disease.
• Participants taking medications that are sensitive substrates for CYPC8, CYP2C19, CYP3A4, CYP1A2, and CYP2C9.
• Participant has a significant history of hypersensitivities or allergies to any medications, as determined by the PI/designee.
• Sexually active males not willing to use a condom during intercourse while taking the study drug and until EOS visit.
• Women of childbearing potential (WOCBP), defined as all women physiologically capable of becoming pregnant.
• Female participants are breastfeeding or female participants with a positive serum pregnancy test at the screening visit or positive urine pregnancy test at admission.
• Participants has poor venous access.
• Participant has history of alcohol and/or illicit drug abuse within 12 months prior dosing or positive alcohol/illicit drug test at screening and/or admission; smoking history (use of tobacco products in the previous 3 months prior dosing) or positive cotinine test at screening or admission.
• Participant has donated blood (> 500 mL) or blood products within 2 months prior to admission (Day -1). Plasma donation (> 200 mL) within 7 days prior to first dosing.
• Participant has previously been enrolled in this clinical study.
• Participant has a positive reverse transcription polymerase chain reaction (RT PCR) test for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
• Participant has clinical signs and symptoms consistent with SARS-CoV-2 infection, e.g., fever, dry cough, dyspnea, sore throat, fatigue, or laboratory confirmed acute infection with SARS-CoV-2.
• Participant who had a severe course of COVID-19; (extracorporeal membrane oxygenation, mechanically ventilated, or Intensive Care Unit stay).

matching placebo