Table 3.

Preferred terms retrieved from FAERS reports for Z-drugs.

#	Eszopiclone (n=458)		Zaleplon (n=77)		Zolpidem (n=3448)
	Preferred term	n (%)	Preferred term	n (%)	Preferred term	n (%)
1	Drug ineffective	78 (17.0)	Drug ineffective	18 (23)	Drug ineffective	499 (14.5)
2	Insomnia	33 (7.2)	Drug effect incomplete	3 (4)	Insomnia	146 (4.2)
3	Product substitution issue	30 (6.6)	Insomnia	3 (4)	Product substitution issue	96 (2.8)
4	Dysgeusia	22 (4.8)	Product quality issue	3 (4)	Somnambulism	75 (2.2)
5	Product quality issue	16 (3.5)	Product substitution issue	3 (4)	Somnolence	59 (1.7)
6	Drug effect decreased	14 (3.1)	Abnormal behavior	2 (3)	Drug dependence	57 (1.7)
7	Delirium	12 (2.6)	Drug hypersensitivity	2 (3)	Amnesia	51 (1.5)
8	Headache	7 (1.5)	Malaise	2 (3)	Road traffic accident	48 (1.4)
9	Nausea	7 (1.5)	Nausea	2 (3)	Toxicity to various agents	47 (1.4)
10	Sleep disorder	7 (1.5)	Nightmare	2 (3)	Overdose	46 (1.3)