Bioequivalence and Bioavailability Forum • Cmax ER = Cmax IR ?

Cmax ER = Cmax IR ? [Regulatives / Guidelines]

posted by jag009 – NJ, 2019-12-06 17:38 (499 d 23:25 ago) – Posting: # 20948
Views: 2,008

» » […] a study comparing ER once a day vs IR given multi-times a days, e.g, ER vs IR given every 4 hours. When conducting such studies, the success criteria is based on equivalent AUC (90% CI), and not Cmax due to the nature of the ER drug release kinetic.
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» » I received a comment from the mexico regulatory when they reviewed the protocol. They wanted Cmax as an equivalent criteria as well …
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» What‽ If you would succeed in demonstrating BE of C_max you would have proven that your product is not an ER. Bizarre idea.

Exactly. I am at a lost. I am not sure if the reviewer misread the protocol or he doesn't understand the concept. Having said that (dont laugh), FDA once asked us to show BE for a 505b2 for an once day ER vs IR @ 4 hrs with respect to Cmax and AUC. It was v strange unless they are suspecting that Cmax is associated with efficacy (somehow).

John

Complete thread:

NDA study for Mexico jag009 2019-12-06 16:19 [Regulatives / Guidelines]
- Cmax ER = Cmax IR ? Helmut 2019-12-06 16:41
  - Cmax ER = Cmax IR - the only option mittyri 2019-12-06 17:08
    - Cmax ER = Cmax IR - the only option Helmut 2019-12-06 17:36
  - Cmax ER = Cmax IR ?jag009 2019-12-06 17:38
    - Cmax ER = Cmax IR ? Helmut 2019-12-06 17:45
      - Cmax ER = Cmax IR ? jag009 2019-12-06 21:21
        
        Cmax ER = Cmax IR ? Yura 2019-12-06 22:40
        
        Cmax ER = Cmax IR ? jag009 2019-12-09 18:15