In the study period, 730 patients were admitted and 66 (9%) of them met the criteria for inclusion; 45 (68%) continued medication with tramadol until discharge from the unit, while 21 (32%) had to switch to an opioid for moderate to severe pain. The reason for switching was uncontrolled pain in 16 (76%) patients, and for 5 (24%) patients, the switch was made for other reasons.