• Plasmatic and intracellular concentration of raltegravir [ Time Frame: 10 days ] [ Designated as safety issue: No ]
  

• Clearance, CL/F [ Time Frame: 10 days ] [ Designated as safety issue: No ]
  
• Volume of distribution, V/F [ Time Frame: 10 days ] [ Designated as safety issue: No ]
  
• Elimination half-life, t1/2 [ Time Frame: 10 days ] [ Designated as safety issue: No ]
  
• Area under the plasma concentration-time curve during the dosing interval AUC0-24 [ Time Frame: 10 days ] [ Designated as safety issue: No ]
  
• Maximum concentration [ Time Frame: 10 days ] [ Designated as safety issue: No ]
  
• Time to maximum concentration, Tmax [ Time Frame: 10 days ] [ Designated as safety issue: No ]
  
• Minimum concentration [ Time Frame: 10 days ] [ Designated as safety issue: No ]
  

HIV integrase is the enzyme responsible for transferring the DNA encoded by HIV to host chromosomes, a necessary step for the replication of retroviruses. Raltegravir (RAL) is the first integrase inhibitor approved for HIV treatment of patients infected by this virus. RAL has demonstrated a marked antiretroviral activity against HIV strains resistant to other antiretroviral drug families and high virological efficacy in patients pre-treated so as naïve to antiretroviral treatment. In addition, its safety profile is very favourable.

Unlike what happens with other antiretrovirals such as protease inhibitors, there is not a relationship between the virological response to antiretroviral treatment with RAL and the trough concentration of drug in plasma. Similarly, in vitro studies have shown that, after infection of cultured cells, the rate of viral replication measured by p24 antigen production was continuing inhibited even when RAL was washed from the culture medium from the 8 hours after infection, suggesting the possibility of a post-antibiotic effect of the drug. Either way, as in the case of transcriptase inhibitor nucleoside analogues, this lack of correlation between pharmacokinetics and pharmacodynamics of RAL may only be the result of intracellular accumulation of drug in blood lymphocytes peripheral, which in turn could be explained either by setting the RAL to the pre-integration complex or through the saturation of certain cellular transporters responsible for pumping the RAL from the inside out-cell (efflux transporters). Anyway, the result would be a greater RAL intracellular half-life than plasmatic, which would translate into a clinically persistent antiretroviral effect compared with its concentration in plasma.

Based on the above is possible to suggest that the average life of RAL was longer in the peripheral blood lymphocytes than in plasma, and that this intracellular increased half-life could explain the absence of relationship between trough RAL concentration and its virological efficacy, post-antibiotic effect of RAL found in some studies in vitro which, on the other hand, could be relevant to the possible once-daily administration of raltegravir.