The two formulations were considered to be pharmacokinetically equivalent if the 90 % confidence intervals ( CIs ) of the log-transformed ratios ( intravenous/oral formulations ) of the area under the plasma concentration-time curve ( AUC ) from time zero to the time of the last measurable concentration ( AUClast ) and the AUC from time zero to infinity ( AUC ) were within the standard bioequivalence range ( 0.8-1 .25 ) .