The purpose of this study is to evaluate the safety and tolerability and evaluate pharmacokinetics of single and multiple ascending oral doses of ASP8062 in nonelderly Japanese male and female subjects.

Inclusion Criteria:

• Body weight at screening: ≥ 50.0 kg and < 80.0 kg for male, ≥ 40.0 kg and < 70.0 kg for female.
• Body Mass Index (BMI) at screening: ≥ 17.6 kg/m^2 and < 26.4 kg/m^2 [BMI = Body weight (kg) ÷ {Body height (m)^2}].
• Female subjects must agree to consistently use 2 forms of highly effective birth control starting at screening and throughout the study period and for 28 days after the final study drug administration.
• Female subjects must not donate ova starting at informed consent and throughout the clinical study period, and for 28 days after the final study drug administration.
• Male subjects and female spouse/partners who are of childbearing potential must be using condom and one of the highly effective birth control starting informed consent throughout the clinical study period and for 90 days after final study drug, if vasectomy is not performed for male subjects.
• Male subjects must not donate sperm starting at informed consent and throughout the clinical study period, and for 90 days after study drug administration.

Exclusion Criteria:

• Subjects who participated or are scheduled to participate in any clinical trials or post-marketing studies within 120 days before screening test or during the screening test to the hospital admission (Day -2).
• Subjects who received or is scheduled to receive any medications (including over-the-counter drugs) within seven days before the hospital admission.
• Any deviation from the normal range of blood pressure, pulse, body temperature, or routine 12-lead ECG at screening or on the day of hospital admission (Day -1).
• Subjects who meet any of the criterion for laboratory tests at screening or on the day of hospital admission (Day -2).
• Any deviation from the normal range of routine 12-lead ECG at screening.
• Subjects with a complication or history of drug allergies.
• Subjects who developed upper gastrointestinal symptoms (nausea, vomiting, stomachache, etc.) within seven days before the hospital admission.
• Subjects with a history of gastrointestinal resection except for appendicitis.
• Subjects with a complication or history of hepatic disease, cardiac disease, respiratory disease, gastrointestinal disease, renal disease, endocrine disease, cerebrovascular disease or malignant tumor.
• Subjects who received ASP8062 previously.
• Subject has a relevant history of suicide attempt or suicidal behavior.

Access to anonymized individual participant level data will not be provided for this trial. Further details on Astellas' data sharing policy can be found at https://www.clinicaltrials.astellas.com/transparency/.