This invention relates to a device with a display (8) for displaying graphics, text and/or combinations thereof, the device has a processor (230) that is interfaced with said display, where the processor can compute and cause the display to display when to administer bolus insulin in which dose(s), when insulin at several occasions in fact were administered and in which doses at these occasions. Moreover, the processor can compute data linking a treatment regimen and insulin administered in the past. A display of the relations between the treatment regimen and the insulin administered in the past are possible. Moreover, a display of data, e.g. a graph, showing insulin administered in the past for longer periods, e.g. more days, months, etc. is possible. The data is useful in a dialogue between a health care person and a diabetic patient.