Ricky N Bluthenthal1, Daniel Chu2, Lynn D Wenger3, Philippe Bourgois4, Thomas Valente2, Alex H Kral3. 1. Department of Preventive Medicine, Institute for Prevention Research, Keck School of Medicine, University of Southern California, 2001 N. Soto Street, Los Angeles, CA, United States. Electronic address: rbluthen@usc.edu. 2. Department of Preventive Medicine, Institute for Prevention Research, Keck School of Medicine, University of Southern California, 2001 N. Soto Street, Los Angeles, CA, United States. 3. Behavioral and Urban Health Program, RTI International, 351 California St., San Francisco, CA, United States. 4. Department of Psychiatry and Biobehavioral Sciences, UCLA Center for Social Medicine and the Humanities, Semel Institute, 760 Westwood Plaza, Los Angeles, CA, United States.
Abstract
BACKGROUND: Heroin use is increasing in the US. Heroin use may predispose users towards injection routes of drug administration as compared to other illicit substances. OBJECTIVE: To explore the relationship between heroin use and drug injection, we compared time from first use to first injection (referred to as time to injection onset by drug [TTIOD]) of heroin, methamphetamine/speed, cocaine, and crack cocaine among people who inject drugs (PWID). METHODS: Age of first use and first injection by drug was collected from 776 PWID. Survival analyses were used to determine TTIOD and to examine demographic factors associated with TTIOD. Cox regression analysis was used to determine demographic factors associated with drug-specific injection onset. RESULTS: The eventual injection onset rate by the drug was 99% for participants who used heroin, 85% for participants who used methamphetamine/speed, 80% for participants who used powder cocaine, and 38% for participants who used crack cocaine. Hazard ratios for injection use within one year of first use by drug were: 1.37 (median survival time [MST] = 0.61 years) for heroin, 0.66 (MST = 1.10 years) for methamphetamine/speed, 0.50 (MST = 2.93 years) for powder cocaine, and 0.12 (MST = 39.59 years) for crack cocaine. Demographic differences in TTIOD were found for each drug. Demographic differences were found for eventual injection by drug for all substances except heroin. CONCLUSION: Among PWID, heroin use was associated with a more rapid transition to injection and a higher rate of eventual heroin injection regardless of demographics. More robust, innovative efforts to reduce heroin use and prevent injection initiation are urgently needed.
BACKGROUND:Heroin use is increasing in the US. Heroin use may predispose users towards injection routes of drug administration as compared to other illicit substances. OBJECTIVE: To explore the relationship between heroin use and drug injection, we compared time from first use to first injection (referred to as time to injection onset by drug [TTIOD]) of heroin, methamphetamine/speed, cocaine, and crack cocaine among people who inject drugs (PWID). METHODS: Age of first use and first injection by drug was collected from 776 PWID. Survival analyses were used to determine TTIOD and to examine demographic factors associated with TTIOD. Cox regression analysis was used to determine demographic factors associated with drug-specific injection onset. RESULTS: The eventual injection onset rate by the drug was 99% for participants who used heroin, 85% for participants who used methamphetamine/speed, 80% for participants who used powder cocaine, and 38% for participants who used crack cocaine. Hazard ratios for injection use within one year of first use by drug were: 1.37 (median survival time [MST] = 0.61 years) for heroin, 0.66 (MST = 1.10 years) for methamphetamine/speed, 0.50 (MST = 2.93 years) for powder cocaine, and 0.12 (MST = 39.59 years) for crack cocaine. Demographic differences in TTIOD were found for each drug. Demographic differences were found for eventual injection by drug for all substances except heroin. CONCLUSION: Among PWID, heroin use was associated with a more rapid transition to injection and a higher rate of eventual heroin injection regardless of demographics. More robust, innovative efforts to reduce heroin use and prevent injection initiation are urgently needed.
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