Bioequivalence and Bioavailability Forum

Main page Policy/Terms of Use Abbreviations Latest Posts

 Log-in |  Register |  Search

Back to the forum  Query: 2018-05-24 17:56 CEST (UTC+2h)
 
Amira
Junior

Egypt,
2017-09-26 12:26

Posting: # 17829
Views: 1,663
 

 Atorvastatin intra-subject Variability [Study As­sess­ment]

Hello,

Atorvastatin Calcium is known as highly variable drug but when we conducted a BE study on it, the results gave low intra-subject Variability (18%) and that's inconsistent with the usual results.
What could be the reason/s for this?

Thank you.


Edit: Category changed; see also this post #1. [Helmut]
ElMaestro
Hero

Denmark,
2017-09-26 12:51

@ Amira
Posting: # 17830
Views: 1,440
 

 Atorvastatin intra-subject Variability

Hi Amira,

Chance?
Better assay?
Design differences?
Lesser within-batch variability (-ies) than in the studies you compare to?

“A ten-year, double-blind study from the Mayo Clinic concluded that even in late stages of dementia, the last to go is the lobe of the brain in charge of cafeteria layout.” (Serge Storms/Tim Dorsey).


Best regards,
ElMaestro

- Bootstrapping is a relatively new hobby of mine. I am only 30 years late to the party.
nobody
Senior

2017-09-27 10:11

@ ElMaestro
Posting: # 17832
Views: 1,401
 

 Atorvastatin intra-subject Variability

» Chance?
Maybe, but...

» Better assay?
No

» Design differences?
How?

» Lesser within-batch variability (-ies) than in the studies you compare to?
Variability has been attributed to various physiological sources, including e.g. liver function, transporter status:

https://www.ncbi.nlm.nih.gov/pubmed/22167570
https://www.ncbi.nlm.nih.gov/pubmed/21548957
https://www.ncbi.nlm.nih.gov/pubmed/20818835

Kindest regards, nobody
Helmut
Hero
Homepage
Vienna, Austria,
2017-09-27 11:05

@ nobody
Posting: # 17833
Views: 1,387
 

 Atorvastatin intra-subject Variability

Hi ElMaestro & nobody,

» » Chance?
» Maybe, but...

Quick calculations based on published CV (~35%), full replicate designs (n 40–64): Very, very unlikely; p <10–16.

[image]Cheers,
Helmut Schütz 
[image]

The quality of responses received is directly proportional to the quality of the question asked. ☼
Science Quotes
Back to the forum Activity
 Thread view
Bioequivalence and Bioavailability Forum | Admin contact
18,290 posts in 3,889 threads, 1,165 registered users;
17 users online (1 registered, 16 guests).

Facts do not cease to exist because they are ignored.    Aldous Huxley

The BIOEQUIVALENCE / BIOAVAILABILITY FORUM is hosted by
BEBAC Ing. Helmut Schütz
XHTML/CSS RSS Feed