Methodological Approaches to Determination of Depressor Substances in Medicinal Products

In order to harmonise national and foreign requirements for quality control of medicinal products, a second variant of the test method, which complies with the requirements of the European Pharmacopoeia, was included into the general monograph OFS.1.2.4.0008.18 “Test for depressor substances”. The aim of the study was to compare the two variants of the in vivo test method that uses cats for determination of depressor substances in medicinal products and to develop recommendations for the use of these two variants of the test method. The comparative analysis of the two ways of determining impurities that lower blood pressure revealed different approaches to performing the test and to testing an animal's sensitivity to the reference solution (histamine dihydrochloride). It was demonstrated that different concentrations, volumes, and doses of medicinal products are used to assess the results of testing performed by variants 1 and 2 of the test method according to the pharmacopoeial requirements. Based on the established differences in the methodological approach to determination of depressor substances in medicinal products, the authors developed recommendations for each of the test variants. The inclusion of two variants of the test method in the general monograph provides an opportunity to evaluate the quality of medicinal products under the most appropriate conditions and, consequently, to improve the validity of test results.

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