When can a Chemical Substance be qualified as a “New Active Substance”? The New Reflection Paper of the EMA gives Information

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New Drug Approvals

When can a Chemical Substance be qualified as a “New Active Substance”? The New Reflection Paper of the EMA gives Information

A chemical structure with a therapeutic moiety for which no authorisation dossier has been submitted so far and which is – from a chemical structure point of view – not related to any other authorised substances is per se a “NAS” (New Active Substance). But what about a physiologically active molecule present for example in different salts or esters? In which cases do the different derivatives of an effective substance have the NAS status?

The EMA provides clarification to these questions in a new Reflection Paper which was published on 19 January this year. The document entitled  “Reflection paper on the chemical structure and properties criteria to be considered for the evaluation of new active substance (NAS) status of chemical substances” describes the criteria according to which isomers, mixtures of…

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