A Study to Assess the Safety, Tolerability and Pharmacokinetics of ASP3700 in Healthy Male Subjects

This study consists of 2 parts: Part 1 is a single ascending dose study where subjects will receive either ASP3700 or matching placebo; Part 2 is a drug-drug interaction (DDI) open-label, crossover study comprised of 1 sequence with 2 investigational periods where subjects will receive ASP3700 alone and in combination with itraconazole.

Inclusion criteria

• Subject has a body mass index range of 18.5 - 30.0 kg/m2. The subject weighs at least 50 kg.
• Subject and his female spouse/partners who are of childbearing potential must be using highly effective contraception consisting of 2 forms of birth control (1 of which must be a barrier method) starting at screening and continue throughout the clinical study period and for 90 days after the final study drug administration.
• Subject must not donate sperm starting at screening and throughout the clinical study period and for 90 days after the final study drug administration.

Exclusion criteria

• Subject has a known or suspected hypersensitivity to ASP3700 (parts 1 and 2) or itraconazole (part 2 only) or significant adverse reactions to historical cannabinoid use or any components of the formulations used.
• Subject has any of the liver function tests (aspartate aminotransferase [AST], alanine aminotransferase [ALT], alkaline phosphatase, gamma-glutamyl transaminase, total bilirubin [TBL]) above the upper limit of normal (ULN). In such a case the assessment may be repeated once (upon admission to the clinical unit).
• Subject has a history of a suicide attempt or suicidal behavior. Any recent suicidal ideation within the last 3 months or who are at significant risk to commit suicide, as judged by the Investigator using the C-SSRS (a level of 4 or 5) at screening or upon admission to the clinical unit.
• Subject has any clinically significant abnormality following the Investigator's review of the physical examination, ECG and clinical study protocol-defined clinical laboratory tests at screening or upon admission to the clinical unit.
• Subject has a pulse rate < 40 or > 90 beats per minute; mean SBP > 140 mmHg; mean DBP > 90 mmHg (vital signs measurements taken in triplicate after subject has been resting in supine position for 5 minutes; pulse rate will be measured automatically) upon admission to the clinical unit.
• Subject has a mean corrected QT interval using Fridericia's formula (QTcF) interval > 430 ms at day -1. If the mean QTcF exceeds the limits above, 1 additional triplicate ECG can be taken.
• Subject has a history of smoking more than 10 cigarettes (or equivalent amount of tobacco) per day within 3 months prior to admission to the clinical unit.
• Subject has a history of drinking more than 21 units of alcohol per week (1 unit = 10 g pure alcohol = 250 mL of beer [5%] or 35 mL of spirits [35%] or 100 mL of wine [12%]) within 3 months prior to admission to the clinical unit.
• Subject has consumed grapefruit, grapefruit-containing products or Seville orange-containing products within 72 hours prior to admission to the clinical unit.