Dear all,
I wonder how can we model continuous subcutaneuos infusion (c.s.c) for a protein drug given by a pump. The drug is input as zero order into the absorption compartment then absorbed as first order into the systemic circulation. From i.v. data we know that t1/2 is ~ 10 hrs, V is 100 mL/kg. From SC bolus we know that ka is about 0.5 hr-1 . I looked at the available models in WinNonlin library and could choose the c.i.v. infusion model no. 2 and first order input model no. 3 . (using multiple SC boluses at very small increments) Both could fit the data properly but I beleive they are not the correct models for such route of administration.
I wonder whether you have a custom code with both zero and first order input (and 1 disposition compartment).
Thanks for your help.
KInd Regards,
Youssef