Objective-This study examined the correlates of injection drug use (IDU) in a community sample of psychostimulant users. Factors related to the cessation of illicit drug use and substance abuse service utilization were also determined among a subsample of stimulant users who reported IDU.Method-The study sample consisted of 3408 lifetime psychostimulant users from the National Household Survey on Drug Abuse. Logistic regression procedures were used to estimate independent associations of correlates of IDU.Results-Approximately one in seven lifetime stimulant users reported IDU in their lifetime. Stimulant users with a lifetime history of IDU were more likely than those who did not inject to be African-American, not have received a high school diploma, have a history of multiple drug use, and report an onset of stimulant use before age 18. Among recent stimulant users, being aged 26 or older, using stimulants at least weekly, and getting drunk in the past year were associated with increased odds of recent IDU. Only one-half of all injection drug users reported having ever used substance abuse services. Cessation of illicit drug use among injectors with a history of stimulant use is common (44%).Conclusions-Further studies should clarify the natural history of IDU among stimulant users, including the cessation of drug use without participating in substance abuse treatment services.
KeywordsAlcohol use; Injection drug use; Methamphetamine; NHSDA; Stimulants Reports tracking U.S. drug use trends have suggested an increase in the use of methamphetamine or amphetamine and in the intravenous administration of these drugs (1-6). Both noninjection and injection users of methamphetamine engage in high rates of sexual risk behaviors (7-11). These behaviors and the increased prevalence of injection drug use (IDU) place stimulant users at increased risk for HIV and hepatitis virus infections (8,9,12,13). For instance, a study of 807 prison inmates found that 37% of methamphetamine users reported IDU in the 6 months preceding their current incarceration compared with 11% of other drug users (14). Methamphetamine-using injection drug users (IDUs) are more likely than injectors who do not use methamphetamine to inject drugs with used needles or syringes, to share needles, and to use unbleached injection equipment (9). Methamphetamine users who become IDUs tend to use methamphetamine heavily and have comorbid psychiatric problems (15). Other characteristics related to becoming injectors may include the use of multiple drugs, heavy alcohol use, and early onset of gateway drugs (16-18). IDUs appear to represent a subgroup of long-term, chronic drug users. Those who reported ever receiving any drug abuse treatment started their drug use early and tended to continue using drugs for a long period of time (23,24). Many injectors, particularly those in drug abuse treatment, reported an injection history of more than 10 years (24,25). Liebman et al (23). found that the mean age of first injection was 20.7 years, with a mean of 1...