Emesis criteria for study comparing IR vs. MR formulations [Study Per­for­mance]

posted by Helmut Homepage – Vienna, Austria, 2019-10-16 11:53  – Posting: # 20692
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Hi Rock,

» In a study comparing Test (Immediate Release) vs. Reference (Modified Release) formulations, on which formulations the withdrawal criteria on emesis should be based …

For the IR formulation most people opt at two times the median tmax.
For the MR formulation the entire intended dosing interval.

» … and why?

IR: That’s the inflection point of the profile where absorption is essentially (98.44%) complete.
MR: Since you likely are facing flip-flop PK (where the late part of the profile represents absorption). Hence, for o.a.d. 24 hours, for b.i.d. 12 hours (even if you administered it only once).

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