Table 1.

Opioids used during the study period, recorded as the starting (index) and the resulting opioid (target) of the opioid switch.

Opioid	As Index Opioid (n)	As Target Opioid (n)
Alfentanil	26	41
Buprenorphine	2	4
Codeine	16	3
Diamorphine	6	7
Dihydrocodeine	1	1
Hydromorphone	10	9
Fentanyl	0	29
Morphine	81	53
Oxycodone	68	63