The study of the in vivo-in vitro correlation of the naftopidil sustained-release tablet in dog / 生物医学工程学杂志

ABSTRACT

We studied the correlation of sustained-release tablet of naftopidil between the in vitro release and the in vivo absorption in the dog. The release rate (X) of naftopidil sustained-release tablet in artificial gastric fluid was determined and the naftopidil concentration in plasma was determined after a single oral dose of 100 mg naftopidil (tablet or sustained-release tablet) in the dog. The absorbed fraction(F) and in vivo absorption rate (A) of the NAF sustained-release tablet in the dog at different time were calculated by W-N method and deconvolution method, respectively. Then the regression equations between F or A and X of the corresponding time point were obtained F=2. 1533X - 27. 636(r = 0.9927) and A=2.3452X - 25.474(r= 0.9938). W-N method and deconvolution method both indicated that the correlation between the in vitro release and the in vivo absorption in the dog of the NAF sustained-release tablet was good.