Quality of omeprazole purchased via the Internet and personally imported into Japan: comparison with products sampled in other Asian countries

Objective To evaluate the quality of omeprazole personally imported into Japan via the Internet and to compare the quality of these samples with previously collected samples from two other Asian countries. Methods The samples were evaluated by observation, authenticity investigation and pharmacopoeial quality analysis. Quality comparison of some selected samples was carried out by dissolution profiling, Raman spectroscopy and principle component analysis (PCA). Results Observation of the Internet sites and samples revealed some discrepancies including the delivery of a wrong sample and the selling of omeprazole without a prescription, although it is a prescription medicine. Among the 28 samples analysed, all passed the identification test, 26 (93%) passed the quantity and content uniformity tests and all passed the dissolution test. Dissolution profiling confirmed that all the personally imported omeprazole samples remained intact in the acid medium. On the other hand, six samples from two of the same manufacturers, previously collected during surveys in Cambodia and Myanmar, frequently showed premature omeprazole release in acid. Raman spectroscopy and PCA showed significant variation between omeprazole formulations in personally imported samples and the samples from Cambodia and Myanmar. Conclusions Our results indicate that the pharmaceutical quality of omeprazole purchased through the Internet was sufficient, as determined by pharmacopeial tests. However, omeprazole formulations distributed in different market segments by the same manufacturers were of diverse quality. Measures are needed to ensure consistent quality of products and to prevent entry of substandard products into the legitimate supply chain. Objectif Evaluer la qualité de l'omeprazole importé personnellement au Japon via Internet et comparer la qualité de ces échantillons avec des échantillons prélevés précédemment dans deux autres pays asiatiques. Méthodes Les échantillons ont été évalués par observation, investigation d'authenticité et analyse de qualité pharmacopée. La comparaison de la qualité de certains échantillons sélectionnés a été effectuée par profilage de dissolution, spectroscopie Raman et analyse des composants principaux (ACP). Résultats L'observation des sites Internet et des échantillons a révélé certaines divergences, notamment la livraison d'un mauvais échantillon et la vente d'omeprazole sans prescription, bien qu'il s'agisse d'un médicament sous prescription. Parmi l