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Zidovudine (AZT) is one of first choice drugs for the treatment of acquired immunodeficiency syndrome (AIDS). Despite its efficacy to control virus replication, the extent of adverse effects and the therapeutic regimen are directly related to patients’ non-compliance. In this work, we evaluated the permeability and in vivo distribution of AZT incorporated into poly(Ɛ-caprolactone), PCL, nanoparticles...