Table 5.

Average number of fentanyl, fentanyl analogs, and other nonpharmaceutical synthetic opioids advertised on cryptomarkets extracted with the drug abuse ontology [34].

Types of substances			Average number of advertisements per day, by month (number of crawls)
			Agora							Dream Market
			March 2015		April 2015		May 2015		March 2018			April 2018
Fentanyla			130		174		139		207			216
Fentanyl analogs
	Acetyl fentanyl	44		39		41		3			1
	Butyr fentanyl	12		10		17		6			7
	Carfentanil	0		0		0		12			5
	Furanyl fentanyl	0		0		1		31			39
	Methoxy Acetyl fentanyl	0		0		0		14			14
	4-fluroIsoButyr fentanyl	0		0		0		19			16
	3-methoxyMethyl fentanyl	0		0		0		2			2
	Total, fentanyl analogs	56		49		59		87			84
Other NPb synthetic opioids
	U-47,700	5		4		5		0			3
	W-18	5		4		5		0			0
	MT-45	9		8		9		0			0
	AH-7921	0		0		1		0			0
	U-48,800	0		0		0		1			7
	U-49,900	0		0		0		0			1
	U-4TDP	0		0		0		0			4
	U-50,488	0		0		0		8			4
	MPF-47700	0		0		0		0			5
	Total, other NP synth opioids	19		16		20		9			24
Other opioidsc			827		1061		1152		3211			3137
Total (any opioids)			1033		1300		1370		3512			3460

^aIncludes mentions of fentanyl, China white heroine, synthetic heroine, and mentions of pharmaceutical fentanyl such as Duragesic, fentanyl patches, and fentanyl transdermal system.

^bNP: nonpharmaceutical.

^cIncludes mentions of heroin, opium, morphine and other types of pharmaceutical opioids (eg, hydrocodone, oxycodone, and hydromorphone) excluding pharmaceutical fentanyl.