A Pharmacokinetic Study Comparing VI-0521 With Placebo in Obese Adolescents

Inclusion Criteria:

- Provide written informed consent;

- Provide written assent (of study subject);

- Adolescent ≥12 and <18 years of age;

- Have a BMI ≥ the 95th percentile of BMI for age and gender;

- Female subjects must be using adequate contraception;

- Willing and able to comply with all study requirements

Exclusion Criteria:

- Condition or disease interfering with metabolism;

- Any medical treatment with insulin;

- Hyperthyroidism, or clinically significant hypothyroidism;

- Any history of bipolar disorder or psychosis, major depressive disorder, or history of
suicidal behavior or ideation, or any use of antidepressant medications;

- Use of chronic systemic glucocorticoid or steroid therapy;

- History of any eating disorders;

- Any history of laxative abuse;

- Prior bariatric surgery;

- Any history of nephrolithiasis;

- Any history of epilepsy, or treatment with anti-seizure medications;

- Positive urine drug screen;

- Current smoker or smoking cessation within the previous 3 months of screening;

- Obesity of a known genetic or endocrine origin;

- Treatment with any over-the-counter or prescription weight loss drug, or
attention-deficit/hyperactivity disorder (ADHD);

- Allergy or hypersensitivity to phentermine or topiramate or history of anaphylaxis to
any drug;

- Use of any investigational medication or device for any indication or participation in
a clinical study within 30 days prior to screening; or

- Any medical or surgical condition which would impair the ability of the subject to
complete the study, compromise the quality of study data, or pose an unacceptable risk
to the safety of the subject.