A method for preparing both main label and warning label portions for a container useful in dispensing drugs by a pharmacist in which the main label portion contains specific drug or patient information and the warning label portion contains one or more warnings specific to the drug or patient information includes the steps of providing a backing sheet having the main label portion and the warning label portion releasably adhered thereto, printing the drug or patient information on the warning label during only one printing pass, and then affixing both the main label portion and the warning label portion to a drug container.