Chemsex—the use of crystallised methamphetamine, mephedrone, γ-hydroxybutyrate or γ-butyrolactone and to a lesser extent cocaine and ketamine to facilitate sex—has emerged as a new phenomenon in the UK and across Europe amongst gay, bisexual and other men who have sex with men (GBMSM). A new HIV Medicine study reveals that chemsex disclosure in sexual health settings is associated with higher rates of new diagnoses of HIV, Hepatitis C, and other sexually transmitted infections.

For the study, researchers reviewed information on all GBMSM attending 2 London sexual health clinics over a 13 month period. Those who reported that they had participated in chemsex were 5-times more likely to have a new diagnosis of HIV than those who had not participated in chemsex.

Although it was not possible to determine if chemsex causes HIV infection, the investigators note that use of drugs in sexual settings and alcohol has been linked with condomless anal sex and other behaviours predisposing to HIV transmission.

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