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Sex-by-formulation interaction in bioequivalence trials with transdermal patches.

Abstract：

PURPOSE:The existence of a sex-by-formulation interaction in bioequivalence studies implies that the bioequivalence results (i.e., the test/reference ratio of the pharmacokinetic parameters) obtained in one sex are not similar to those obtained in the other sex. Therefore, results obtained in studies including only males may not be representative of the results obtained in females and vice versa. The best evidence of the existence of a sex-by-formulation interaction has been obtained from a study conducted with transdermal patches. This observation might be caused by the different characteristics of the skin of males and females. The purpose of this work is to investigate the existence of a sex-by-formulation interaction in all bioequivalence studies of transdermal patches submitted to the Spanish Agency for Medicines between 2010 and 2016. METHODS:Only five different products (Buprenorphine-1, Fentantyl-1, Fentanyl-2, Rivastigmine-1 and Rivastigmine-2) that were submitted for registration included nine bioequivalence studies conducted in males and females. As single dose and multiple dose studies are required for registration of transdermal patches in the European Union, more than one study may be available to confirm the existence of a sex-by-formulation interaction. RESULTS:A sex-by-formulation interaction is suggested in six out of 27 datasets (22%), corresponding to two products, and it is statistically significant in three of them (11%). CONCLUSIONS:The sex-by-formulation interaction detected in some pharmacokinetic parameters of some studies is excluded when the study is repeated, which shows that these results are not reproducible. There is no evidence to require bioequivalence demonstration for transdermal patches in males and females separately.

journal_name

Eur J Clin Pharmacol

journal_title

European journal of clinical pharmacology

authors

González-Rojano E,Marcotegui J,Morales-Alcelay S,Álvarez C,Gordon J,Abad-Santos F,García-Arieta A

doi

10.1007/s00228-019-02632-1

subject

Has Abstract

pub_date

2019-06-01 00:00:00

pages

801-808

issue

6

eissn

0031-6970

issn

1432-1041

pii

10.1007/s00228-019-02632-1

journal_volume

75

pub_type

杂志文章,评审

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