<qa>  What is the regimen that must have remained stable for the 30 days prior to study entry?- Be taking antiretroviral medications which is are approved or is are available under a treatment investigational new drug IND. The regimen must have remained stable for the 30 days prior to study entry. Subjects must also have agreed not to discontinue or to change their regimen for the duration of the study except as judged medically necessary 