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Two acyclic nucleosides, adefovir and cidofovir, are known to cause cumulative dose-dependent renotubular toxicity. Of concern is whether the structurally similar, but more widely used, tenofovir has similar effects. To address this issue, investigators compared glomerular filtration rates (GFRs) among three groups of patients: those receiving tenofovir with a boosted PI, those receiving tenofovir with an NNRTI, and those receiving antiretrovirals other than tenofovir. The 146 patients in this analysis were part of a larger study of therapeutic drug monitoring and had serum creatinine values available at baseline and at week 48 of therapy. GFRs were estimated using standard methods.
During the first 24 weeks of therapy, estimated creatinine …