Abstract: A system for use in pharmacies which uses customer inputs to assist the customer with the selection of an appropriate non-prescription medication to relieve symptoms of an illness, injury or the like. The system uses an expert system to perform the selection. The system utilizes a personal computer with a keyboard, monitor and disk drive as input/output devices with appropriate programming for prompting a user to input information which is used by a knowledgebase to determine non-prescription medications which may be purchased by the customer to relieve symptoms of injuries and illnesses covered by the knowledgebase. The system operates by prompting a user at typically a customer in a pharmacy to input basic customer information. After the basic customer information has been input the customer is prompted to select one main symptom category from a list displayed and the choice made results in the appropriate knowledgebase being loaded for the next step.