The purpose of this study is to evaluate the pharmacokinetics of isavuconazole in healthy non-elderly and elderly male and female subjects.

All subjects receive a single dose of isavuconazole on Day 1 under fasting conditions. Subjects are confined to study center from Day -1 until Day 4 when they are discharged. Subjects return for outpatient visits on Days 6, 8, 11, 13 and 15.

Inclusion Criteria:

• Subjects are healthy, non-elderly males and females between 18 and 45 years and healthy, elderly males and females 65 years of age and older
• The subject has a body weight of at least 45 kg and has a body mass index (BMI) of 18 to 32 kg/m2, inclusive
• The estimated (calculated) creatinine clearance must be within the age-appropriate normal range, if abnormal, the abnormality is not clinically significant, as determined by the Investigator
• Results for aspartate aminotransferase (AST) and alanine aminotransferase (ALT), and total bilirubin must be within the normal range
• The Female subject agrees to sexual abstinence, or is surgically sterile, postmenopausal (defined as at least 2 years at Screening without menses), or using a medically acceptable double barrier method (e.g. spermicide and diaphragm, or spermicide and condom) to prevent pregnancy and agree to continue using this method from Screening until 3 weeks after the follow-up visit at the end of the study; and is not lactating or pregnant as documented by negative pregnancy tests at Screening and Day -1
• The Male subject agrees to sexual abstinence, is surgically sterile, or is using a medically acceptable method to prevent pregnancy and agrees to continue using this method from Screening until 3 weeks after the follow-up visit at the end of the study

Exclusion Criteria:

• The subject has a history of unexplained syncope, cardiac arrest, unexplained cardiac arrhythmia or torsade de pointes, structural heart disease, or family history of Long QT syndrome (suggested by sudden death of a close relative at a young age due to possible or probable cardiac causes)
• The subject has a positive result for hepatitis C antibodies, hepatitis B surface antigen at Screening or is known to be positive for human immunodeficiency virus (HIV)
• The subject has a known or suspected allergy to any of the components of the trial products including the azole class of compounds, or a history of multiple and/or severe allergies to drugs or foods (as judged by the investigator), or a history of severe anaphylactic reactions
• The subject is a smoker (any use of tobacco or nicotine containing products) within 6 months prior to Screening
• The subject, if non-elderly, has had treatment with prescription drugs or complementary and alternative medicines within 14 days prior to Day -1, or over-the-counter medications within 1 week prior to Day -1, with the exception of acetaminophen up to 2 g/day
• The subject, if elderly, has not been on stable concomitant medications (minor necessary dosing changes are acceptable) for at least 4 weeks prior to study drug administration or is taking any medication that would interfere with the evaluation of isavuconazole in this study (CYP3A4 inducer or inhibitor)
• The subject has a recent history (within the last 2 years) of drug or alcohol abuse, as defined by the investigator, or a positive drug and/or alcohol screen