Harmen Beurmanjer

171 Supplements Population description and results Demographics: M=32 years (significant difference (p=0.04) with non-GHB-users, M=33 years). Other: gay 93% (non-GHB users 86% gay, significant difference p=0.03); HIV-positive (31%). GHB use: 29.1% reported GHB-use. Use in previous 4 months: M=6.19, SD=12.45, median 2, range 1-100 days. Location of use: dance clubs (63.3%), circuit parties (37.5%), sex parties (36.7%), friend’s / lover’s place (35.8%), sex clubs or bathhouses (30.5%), bars (29.1%), and at home alone (13.8%). Men who used GHB at sex clubs (p=0.02) and sex parties (P<0.001) were older than users who did not use it in this setting. However, age is related to HIV status (HIV-positive men were older), suggesting that GHB use at sexual settings is asso- ciated with older HIV-positive men. Other substance use: GHB combined with methamphetamine (56.5%), MDMA (46.6%), ketamine (41.2%), alcohol (26.0%),Viagra (22.1%), cannabis (21.4%), amyl nitrate (18.3%), rohypnol (10.7%), barbiturates (10.7%), crack (6.9%), hallucinogens (4.6%), and heroin (1.5%). Demographics: 100% male GHB use more than 6 months ago: M=37.3, SD=10.0 years. Education: less than university level (42.2%), under graduate level (29.6%), post graduate level (27.9%), not stated (0.3%). No work: 14.8%. In relationship: 51.0%. GHB use less than monthly past 6 months: M=38.0, SD=10.3 years. Education: less than university level (33.7%), under graduate level (34.9%), post graduate level (30.8%), not stated (0.6%). No work: 23.3%. In rela- tionship: 49.4%. GHB monthly or more past 6 months: M=36.4, SD=10.2 years. Education: less than university level (42.5%), under graduate level (32.2%), post graduate level (25.3%), not stated (0.0%). No work: 21.8%. In relationship: 46.0%. Other: GHB use more than 6 months ago: (95.1%), HIV-positive (14.8%). GHB use less than monthly pas6t 6 months: (98.9%), HIV-positive (15.7%). GHB monthly or more past 6 months: (98.9%), HIV-positive (16.1%). GHB-use: no GHB-use (n=2566, 80.4%), history of GHB-use (19.6%): used GHB more than 6 months ago (n=365; 11.4%), use past 6 months less than monthly (n=172, 5.4%), use past 6 months monthly or more frequently use (n=87, 2.7%). Overdose was experienced by 14.7%, more common among men who used GHB at least monthly or more (once: 22.7% vs. 28.7%; more than once 13.4% vs. 21.8%). Being HIV-positive, having more gay friends, greater social engagement with gay men who use drugs, a greater number of sexual partners, group sex, and condomless anal intercourse with casual partners were independently associated with GHB use in the past 6 months. Greater social engagement with gay men who use drugs and group sex were independently associated with at least monthly use. More frequent GHB use was independently associated with experiencing overdose among GHB users. Obtain from: dealer (43.6%), gay friends (29.3%), sex partner (10.8). Participants who used GHB in last 6 months, most mentioned reason of use: sexually aroused (30.5%), it was available (25.1%), it would help them lose their inhibitions (24.3%). GHB-users who used GHB more at least monthly mentioned for fun, to encounter the effects of other drugs, to feel connected to other men, to lose their inhibitions, to make it easier to be the receptive partner during anal intercourse more often than men who used less frequently GHB. More frequent users ascribed more positive outcomes to their drug use.