RS is 31 -yeаr-оld mаle whо is HIV pоsitive. At his lаst visit 6 months ago, he was stable with a CD4 count of 375 cells/mm3 and viral load of 10,000 copies/ml and refused to take any anti-retroviral therapy. He urgently presents to the clinic today with mild symptoms of shortness of breath, fever and cough. His laboratory studies at this visit reveal a CD4 count of 175 cell/mm3 and viral load of 175,000 copies/ml. He states that he is allergic to sulfa but does not know the reaction. His chest x-ray is consistent with Pneumocystis jerovici pneumonia. His provider wants to start therapy. What first line therapy would you recommend?