TABLE 2.

The total number of different drug names and their total usage frequencies.

Opioid classes	RxCUI	RxNorm Name	No. of different names	Usage frequency of RxNorm name	Usage frequency of all different names	Percentage (%) of RxNorm name usage
buprenorphine	1716058	belbuca	6	553	577	95.8
	203840	buprenex	5	57	98	58.2
	1819	buprenorphine	28	2,032	10,383	19.6
	904871	butrans	13	52,880	52,992	99.8
	352364	buprenorphine/naloxone	52	33	2,626	1.3
	352990	suboxone	9	19,420	21,450	90.5
codeine	2670	codeine	45	24,572	25,926	94.8
	817579	acetaminophen/codeine	252	4	28,225	0.0
	993764	capital and codeine	2	12	17	70.6
	993837	acetaminophen 300 mg/codeine phosphate 30 mg oral tablet [tylenol with codeine]	18	0	3,544	0.0
	220586	tylenol with codeine	18	7,948	9,708	81.9
	689561	acetaminophen/butalbital/caffeine/codeine	6	0	73	0.0
	217126	fioricet with codeine	4	271	408	66.4
	214160	aspirin/butalbital/caffeine/codeine	5	0	19	0.0
	217127	fiorinal with codeine	7	156	321	48.6
	689522	aspirin/carisoprodol/codeine	2	0	107	0.0
	214444	codeine/promethazine	20	0	412	0.0
dihydrocodeine	23088	dihydrocodeine	24	2,515	4,183	60.1
	689569	acetaminophen/caffeine/dihydrocodeine	10	0	88	0.0
	746611	trezix	2	28	52	53.8
fentanyl	1053648	abstral	11	959	1,115	86.0
	215008	actiq	2	26,948	26,952	100.0
	151678	duragesic	35	36,144	42,325	85.4
	4337	fentanyl	52	26,441	77,019	34.3
	668619	fentora	10	26,069	27,515	94.7
	1115547	lazanda	5	199	219	90.9
	1237051	subsys	4	9,191	9,372	98.1
	49991	droperidol/fentanyl	5	0	64	0.0
hydrocodone	5489	hydrocodone	30	48,914	51,638	94.7
	1442523	zohydro	3	444	450	98.7
	214182	acetaminophen/hydrocodone	286	73	77,739	0.1
	144254	lortab	31	21,941	23,044	95.2
	491666	lorcet	13	524	1,042	50.3
	218772	norco	22	57,621	57,839	99.6
	128793	vicodin	47	41,950	42,663	98.3
	214614	homatropine/hydrocodone	26	0	479	0.0
	992657	hycodan	12	392	569	68.9
	220542	tussigon	3	14	25	56.0
	214392	chlorpheniramine/hydrocodone	22	0	333	0.0
	730984	tussicaps	3	44	53	83.0
	214627	hydrocodone/ibuprofen	28	131	867	15.1
	220826	vicoprofen	4	1,226	1,239	99.0
	214631	hydrocodone/pseudoephedrine	2	0	15	0.0
hydromorphone	224913	dilaudid	30	50,623	51,177	98.9
	902730	exalgo	6	9,647	9,963	96.8
	3423	hydromorphone	70	42,380	48,255	87.8
meperidine	6754	meperidine	38	901	2,530	35.6
methadone	202370	dolophine	6	476	619	76.9
	218337	methadone hydrochloride	14	1,261	14,717	8.6
	152751	methadose	3	3,079	3,103	99.2
morphine	203240	kadian	9	21,926	22,161	98.9
	30236	morphine sulfate	58	15,814	45,455	34.8
	203354	ms contin	29	36,726	37,588	97.7
	859959	embeda	3	1,325	1,609	82.3
oxycodone	7804	oxycodone	87	72,895	1,23,099	59.2
	218986	oxycontin	48	92,489	99,146	93.3
	214183	acetaminophen/oxycodone	144	19	21,595	0.1
	42844	percocet	41	71,517	76,726	93.2
	214256	aspirin/oxycodone	12	0	110	0.0
oxymorphone	643147	opana	11	28,670	28,768	99.7
	82064	oxymorphone hydrochloride	2	217	18454	1.2
tapentadol	854137	nucynta	3	28,254	28,332	99.7
	787390	tapentadol	7	1,341	1,528	87.8
tramadol	1148479	conzip	3	51	113	45.1
	82110	tramadol hydrochloride	220	4,994	1,28,410	3.9
	220606	ultram	21	17,853	18,120	98.5
	353062	ultracet	19	4,933	5,220	94.5