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          |   Nucleoside 
            / Nucleotide  Reverse Transcriptase Inhibitors (NRTIs) 
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                  Trizivir (abacavir/lamivudine/ 
                    zidovudine)  
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          |  non 
            Nucleoside Reverse Transcriptase Inhibitors (NNRTIs) 
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          |  Protease 
            Inhibitors (PIs) | 
        
         
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          |  Fixed-dose 
            Combinations  | 
        
         
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                  Atripla  
                    (efavirenz/emtricitabine/ 
                    tenofovir)  
                 | 
               
               
                |  
                    
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                 | 
               
               
                |  
                    
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                 | 
               
             
           | 
           
            
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                  Trizivir (abacavir/lamivudine/ 
                    zidovudine)  
                 | 
               
               
                |  
                    
                 | 
                 
                  
                 | 
               
               
                |  
                    
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                 | 
               
             
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          |  Fusion 
            Inhibitor (FIs)  | 
            | 
           CCR5 
            Antagonist | 
            | 
           Integrase 
            Inhibitor  | 
        
         
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