1. Urine drugs of abuse (including amphetamines/methamphetamines, barbiturates, benzodiazepines, cocaine, opioids, phencyclidine, and cannabinoids). A positive test for amphetamines/methamphetamines, barbiturates, opioids, or benzodiazepines may not result in exclusion of subjects if the investigator determines that the positive test is as a result of taking prescription medicine(s) as prescribed. In the event a subject tests positive for cannabinoids (tetrahydrocannabinol), the investigator will evaluate the subject's ability to abstain from prohibited substances during the study. If in the investigator's clinical judgment the subject will abstain, the subject may be enrolled after consultation with the Medical Monitor.