A method and
system is provided for
visualization and pictorial presentation to a user of possible interactions between a prospective
drug that is being considered for prescribing to a person and that person's
genotype. Genetic information of the person that can affect the manner in which a
drug acts on a molecular, physiological or biological function of the body or a tissue, or a manner in which a
drug is being metabolized, absorbed, excreted or otherwise eliminated from the body or a tissue by the body or tissue systems, is entered into a computerized device. The computerized device conducts a search of a drug
database for drugs that have known interactions with the entered genetic information, and assigns a
numeric value to each of a plurality of drugs, either in aggregate, as a class, or individually, in order to quantify the nature, strength and direction of each interaction. The computer sends the assigned numeric values to the computer's output module for their
visual presentation to a user as a graph including a panel of columns, or other geometrical structures, whose geometrical characteristics correspond to the assigned numeric values of each drug, in order to facilitate the prospective drug selection by a prescriber on the basis of the totality of drug-
gene and / or drug-drug interactions presented to the user as a visual graph.