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Cytochromes P450 are a large superfamily of heme-thiolate enzymes involved in the metabolism of many different organic substrates such as drugs, fatty acids and toxic compounds. The aim of this work is to analyse the binding between the cytochrome P4501A2, in solution and in gel-matrix, and its substrate (clozapine), utilising voltammetric tests. The interaction measurements were carried out using two different screen printed electrodes (rhodium-graphite and graphite-riboflavin), and the results were compared. It was demonstrated that it is possible to realise a biosensor prototype to detect the presence of clozapine indirectly by chronoamperometry.