The CODES/neural network model has been successfully applied to the predict
ion of pharmacokinetic properties of therapeutical compounds. The output of
CODES, a graphical module based on the Gestalt isomorphism, is proved to b
e a valuable tool in the design of a neural network model able to predict t
he half-life values of antihistamines. Additionally, the generated models a
re able to classify these drugs in their corresponding therapeutic category
(H-1 or H-2 receptor antagonists).