Undersøgelser har vist, at tenofovir secerneres aktivt tubulært af human organisk aniontransporter (hOAT) 1 og 3 ind i de proksimale tubulusceller (influx) og ud i urinen (efflux) af det multidrug - resistente protein 4 (MRP 4).
Studies have established the pathway of active tubular secretion of tenofovir to be influx into proximal tubule cell by the human organic anion transporters (hOAT) 1 and 3 and efflux into the urine by the multidrug resistant protein 4 (MRP 4).