A flag for labeling medications provided in a medication cup, for use in the sterile field operating room, has a cup section with an adhesive back surface peelably attached to a backing sheet. A flag section is attached to the cup section of the flag at a bend line. A flag strip also having an adhesive back surface is supplied on the backing sheet. Multiple flags of different colors are preferably provided in a kit. A flag is attached to each cup. The flag section is labeled with a marker or a preprinted label, to indicate the content of the cup. The flag section is folded down so that it partially overlies the open top end of the cup. The syringe strip is adhered to a syringe used to draw medication out of the cup for administration to the patient. The flag and syringe strip provide a visual link or connection between each syringe and the contents of each cup. The risk of administering the wrong medication to a patient during surgery is reduced.