TR comes in for a routine clinic appointment today. She has HIV and has been stable on her regimen of darunavir plus ritonavir, tenofovir, and emtricitabine. Which of the following statements regarding ritonavir are correct? (Select ALL that apply.)
A. Ritonavir is used as monotherapy for treating HIV during pregnancy.
B. Ritonavir is a strong inhibitor of 3A4 and 2D6 and has many drug interactions.
C. Ritonavir should be taken on an empty stomach.
D. The brand name is Norvir.
E. Ritonavir can be used to increase the serum drug level of another, concurrently-used protease inhibitor.