Abstract: An I.V. medication warning label designed to inform attending healthcare workers of possible medication incompatibility combinations. The label includes a flexible, main label with a front surface and a back surface. The back surface has an adhesive applied thereto which allows the main label to be attached to an I.V. bag or I.V. line. Printed on the front surface of the main label is a primary medication indicator which informs the healthcare worker of the medication contained in the I.V. line or administered through the I.V. line. Also printed on the main label is a list of compatible medications, a list of incompatible medications, a dose calculation information section, a date of administration/mixture, and a plurality of removable tags with the primary medication indicator printed thereon. The removable tags may be detached from the main label and attached to other injection ports or lines located upstream or downstream from the I.V. bag.