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Effect of Adding Ritonavir to Indinavir
 
Slide 7 of 22
 
Speaker notes: A number of PIs fall to concentrations which are undesirably close to levels where the virus is not fully inhibited:
  • because of inter-individual variability, some individuals may have drug levels below this mark
  • e.g. indinavir (IDV) administered at 800mg TID.
Adding ritonavir (RTV) at 400mg BID with food to IDV 400mg BID shows:
  • prolonged IDV half life (t½)
  • reduced IDV Cmax
  • overall, the IDV Cmin is increased way above the IC95.

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