EMA: Waiving MD study [Regulatives / Guidelines]

posted by Helmut Homepage – Vienna, Austria, 2020-09-09 21:26 (1317 d 13:45 ago) – Posting: # 21914
Views: 2,984

Hi Osama,

❝ ❝ at the end an [image] script to play with.

❝ ❝

❝ ❝ For any elimination half life of > 7 hours and an intended dosing interval of 24 hours it will be impossible to get the MD study waived. Red are formulations with flip-flop PK (kakel).

❝ Could you please kindly add more explanation.

About the script or about what I’m doing here? :-D

OK, seriously: Acc. to the EMA’s GL the MD study can be waived if AUCτ–∞ is ≤10% of AUC0–∞. Of course, in the SD study you would sample longer than τ to get a reliable estimate of λz and show that AUC0–t ≥ 80% AUC0–∞. Furthermore, you would try to show equivalence of partial AUCs.
When you develop an extended release formulation you try to slow down absorption, i.e., decrease the ka/kel-ratio – which the script does. That’s all you can do cause kel is drug-specific. In an ideal case (e.g., no absorption window) the AUC will not be affected, only Cmax will be lower and delayed. So far, so good.
But it has a nasty side effect. The early part of the AUC (until τ) will decrease and the late part increase, making waiving the MD study not possible due to the ≤10% of AUC0–∞ limit.*

Dif-tor heh smusma 🖖🏼 Довге життя Україна! [image]
Helmut Schütz

The quality of responses received is directly proportional to the quality of the question asked. 🚮
Science Quotes

Complete thread:

UA Flag
 Admin contact
22,987 posts in 4,824 threads, 1,663 registered users;
71 visitors (0 registered, 71 guests [including 6 identified bots]).
Forum time: 11:12 CEST (Europe/Vienna)

The only way to comprehend what mathematicians mean by Infinity
is to contemplate the extent of human stupidity.    Voltaire

The Bioequivalence and Bioavailability Forum is hosted by
BEBAC Ing. Helmut Schütz