Part A of the study will test the safety, the amount of drug in the body, and effects of the drug in the body after multiple doses. This will be conducted in healthy overweight adults. Part B of the study will test the effects of multiple doses of the investigational drug on the amount of midazolam, an approved drug, in healthy adults.

Inclusion Criteria:

• Healthy male and/or female subjects between the ages of 18 and 55 years, inclusive (Healthy is defined as no clinically relevant abnormalities identified by a detailed medical history, full physical examination, including blood pressure and pulse rate measurement, 12-lead ECG and clinical laboratory tests). Women must be of non childbearing potential.
• Body Mass Index (BMI) of 27.0 to 35.0 kg/m2 (Part A) or 17.5 to 30.5 kg/m2 (Part B); and a total body weight >50 kg (110 lbs).

Exclusion Criteria:

• Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurologic, or allergic disease (including clinically significant drug allergies, but excluding untreated, asymptomatic, seasonal allergies at time of dosing).
• Subject with any contraindication to midazolam according to the country specific labeling or subject with previous intolerance or allergy to benzodiazepines (applicable to Part B of study only).
• Subjects who were enrolled in Part A are excluded from participation in Part B of this study.
• Subjects who have previously participated in a study with PF-06282999.