Abstract: A method and a non-transitory computer-readable computer program product for identification of effective drugs. The object is to provide a computer simulation method for modelling flow in intracellular networks at lesional and non-lesional disease states and to find potentially effective drugs for specific diseases. The method involves modelling an intracellular network by a network of nodes and directed edges between the nodes, where each node corresponds to any one of protein and DNA, and each edge corresponds to the directed interaction between two nodes.