Abstract
Allometry scaling of preclinical pharmacokinetic parameters for bicifadine (CAS 71195-57-8),
a novel non-narcotic analgesic, was performed to predict the human pharmacokinetic
parameters of clearance (CLiv and CLoral) and volume of distribution (Vz). The metabolism pattern, biotransformation pathways, and the predominant urinary
excretion of the formed metabolites of bicifadine were found to be similar amongst
mice, rats, monkeys and humans facilitating the scaling process. The availability
of gender specific data in the preclinical species rendered the prediction of bicifadine
parameters in gender specific groups. The human parameters for CLiv,Vz, and CLoral were predicted by allometric equations: 1.5252W0.742 (R2 = 0.9989), 1.3489W0.8484 (R2 = 0.9896), 3.2516W0.7694 (R2 = 0.9875), respectively. The absolute bioavailability for bicifadine was estimated
to be approximately 67%. The predicted CLoral (95 L/h) was within 45% of the human reported value (59 L/h). Overall, based on the
closeness of allometric exponents (within 15% of suggested values), simple allometry
approach could be used to prospectively predict the human pharmacokinetic parameters
of bicifadine with confidence.
Key words
Allometiy - Bicafadine, clearance, pharmacokinetics, volume of distribution - CAS
71195-57-8 - Non-narcotic analgesic