TY - JOUR T1 - A NOVEL MODEL FOR PREDICTION OF HUMAN DRUG CLEARANCE BY ALLOMETRIC SCALING JF - Drug Metabolism and Disposition JO - Drug Metab Dispos SP - 1297 LP - 1303 DO - 10.1124/dmd.105.004143 VL - 33 IS - 9 AU - Huadong Tang AU - Michael Mayersohn Y1 - 2005/09/01 UR - http://dmd.aspetjournals.org/content/33/9/1297.abstract N2 - Sixty-one sets of clearance (CL) values in animal species were allometrically scaled for predicting human clearance. Unbound fractions (fu) of drug in plasma in rats and humans were obtained from the literature. A model was developed to predict human CL: CL = 33.35 ml/min × (a/Rfu)0.770, where Rfu is the fu ratio between rats and humans and a is the coefficient obtained from allometric scaling. The new model was compared with simple allometric scaling and the “rule of exponents” (ROE). Results indicated that the new model provided better predictability for human values of CL than did ROE. It is especially significant that for the first time the proposed model improves the prediction of CL for drugs illustrating large vertical allometry. The American Society for Pharmacology and Experimental Therapeutics ER -