Concurrent and Simultaneous Use of Cannabis and Tobacco and Its Relationship with Academic Achievement amongst University Students

The combined use of cannabis and tobacco is frequent in Europe. Few studies have nonetheless explored this pattern of consumption and its relationship with academic achievement in Spanish population. The aim of the present study was to analyze (1) the frequency of four patterns of polydrug use the last year (non-dual users of cannabis and tobacco; concurrent users: cannabis and tobacco separately; simultaneous users: tobacco in cannabis "joints"; simultaneous users: tobacco in cannabis joints alongside alcohol) by gender and age; (2) grade point average (GPA) by gender and age; (3) the association between the frequency of the four patterns of use and the GPA amongst a sample of 477 Spanish university students. The use of cannabis and tobacco (concurrent and simultaneous) and GPA were assessed by means of self-reported questionnaires. Statistically significant differences were found for the GPA with respect to gender. The GPA by the non-dual users of cannabis and tobacco was significantly higher than the GPA corresponding to the concurrent and simultaneous users. The combined use of cannabis and tobacco, regardless of the type of use (concurrent or simultaneous), is moderately related to poor academic achievement amongst university students.

Methamphetamine self-administration reduces alcohol consumption and preference in alcohol-preferring P rats

Subclinical levels of polysubstance use are a prevalent and understudied phenomenon. Alcohol is a substance commonly co‐used with other substances of other drug classes. These studies sought to determine the consumption effects of combining alcohol drinking and methamphetamine (MA) self‐administration. Male alcohol‐preferring P rats had continuous access to a two‐bottle alcohol drinking procedure in the home cage. Control rats remained alcohol naïve. Rats were also surgically implanted with intra‐jugular catheters and trained to self‐administer saline (control) or MA in daily 2‐hour sessions. We first measured the acquisition and maintenance of MA intake in alcohol‐consuming or control rats. MA intake was initially enhanced by alcohol consumption on a fixed ratio 1 schedule of reinforcement, but this effect did not prevail as the difficulty of the schedule (FR5 and progressive ratio) was increased. We next measured both alcohol consumption and preference before, during and after MA (or saline) self‐administration. MA self‐administration significantly reduced alcohol intake and preference ratios, a robust effect that persisted across several experimental variations. Interestingly, alcohol consumption rebounded following the cessation of MA self‐administration. The effects of MA self‐administration were specific to alcohol intake because it did not alter total fluid consumption or consumption of sucrose. MA self‐administration did not impact blood‐alcohol concentrations or alcohol‐induced loss of righting reflex suggesting no effect of MA intake on the alcohol metabolism or sensitivity. Together, the results suggest that MA intake disrupts alcohol consumption and preferences but not the reverse in alcohol‐preferring P rats.

Potential Risks of Ecological Momentary Assessment Among Persons Who Inject Drugs

BACKGROUND

Ecological momentary assessment (EMA)-which often involves brief surveys delivered via mobile technology-has transformed our understanding of the individual and contextual micro-processes associated with legal and illicit drug use. However, little empirical research has focused on participant's perspective on the probability and magnitude of potential risks in EMA studies.

OBJECTIVES

To garner participant perspectives on potential risks common to EMA studies of illicit drug use.

METHODS

We interviewed 38 persons who inject drugs living in San Diego (CA) and Philadelphia (PA), United States. They completed simulations of an EMA tool and then underwent a semi-structured interview that systematically explored domains of risk considered within the proposed revisions to the Federal Policy for the Protection of Human Subjects or the "Common Rule." Interviews were transcribed verbatim and coded systematically to explore psychological, physical, social, legal, and informational risks from participation.

RESULTS

Participants perceived most risks to be minimal. Some indicated that repetitive questioning about mood or drug use could cause psychological (i.e., anxiety) or behavioral risks (i.e., drug use relapse). Ironically, the questions that were viewed as risky were considered motivational to engage in healthy behaviors. The most cited risks were legal and social risks stemming from participant concerns about data collection and security.

IMPORTANCE

Improving our understanding of these issues is an essential first step to protect human participants in future EMA research. We provide a brief set of recommendations that can aid in the design and ethics review of the future EMA protocol with substance using populations.

Fetal Growth Outcomes in a Cohort of Polydrug- and Opioid-Dependent Patients

OBJECTIVES

To evaluate the effects of prenatal polydrug and exclusive opioid use on fetal growth outcomes.

METHODS

This analysis relied on the data obtained from two prospective cohorts at the University of New Mexico. For both cohorts, pregnant women were recruited during one of their prenatal care visits and followed up to delivery. The merged sample included 59 polydrug users, 22 exclusive opioid users, and 278 abstinent controls. Continuous growth measures (birth weight, height, occipital frontal circumference [OFC], and corresponding sex-specific percentiles) were compared by ANOVA and ANCOVA in bivariate and multivariable analyses, respectively. Categorical outcomes (prevalence of small-for-gestational age [SGA] for weight, length, and OFC) were compared among groups by Chi-square and multivariable logistic regression analyses..

RESULTS

The sample included a large proportion of ethnic minorities (78.8% Hispanic) and patients with low educational attainment (68% ≤ high school). The risk of microcephaly (OFC<10th percentile) was significantly greater in the polydrug (OR=4.7; 95% CI: 2.0; 10.8) and exclusive opioid (OR=2.8; 95% CI: 1.0; 8.1) groups compared to abstinent controls.

CONCLUSION

Given that microcephaly is often associated with serious neurocognitive and behavioral deficits later in life, our finding of 49.2% incidence of microcephaly among polydrug users is alarming and requires further investigation.

Favorable Socioeconomic Status and Recreational Polydrug Use Are Linked With Sexual Hepatitis C Virus Transmission Among Human Immunodeficiency Virus-Infected Men Who Have Sex With Men

Increasing incident HCV infections were found between 2011-2014 after declining between 2008-2010 among HIV-infected men in a Community Health Center in Baltimore. The reemerging epidemic was associated with sexual transmission and polydrug use among MSM with favorable socioeconomic status.

Background. Sexual transmission of hepatitis C virus (HCV) among human immunodeficiency virus (HIV)-infected men who have sex with men (MSM) is an emerging issue. Studies addressing the temporal trends and risk factors associated with incident HCV in HIV-infected MSM in the community-based primary care settings in the United States are scarce.

Methods. Using a retrospective cohort study design, HCV incidence, defined as HCV antibody seroconversion, was determined in 1147 HIV-infected men receiving care at Chase Brexton Health Care clinics in Baltimore, Maryland between 2004 and 2014. Multivariate regression analyses were used to identify factors associated with incident HCV.

Results. There were 42 incident HCV infections during 5242 person-years (PY) of follow up (incidence rate [IR], 8.01/1000 PY). Thirty-seven (88%) of the incident infections were in MSM, of whom 31 (84%) reported no injection-drug use (IDU). The annual IRs for MSM were 13.1–15.8/1000 PY between 2004 and 2007, decreased to 2.7–6.2/1000 PY between 2008 and 2011, and increased to 10.4/1000 PY and 13.3/1000 PY in 2013 and 2014, respectively. Injection-drug use was strongly associated with incident HCV among all MSM (IR ratio [IRR], 14.15; P = .003); however, among MSM without IDU, entering care between 2010 and 2013 (IRR, 3.32; P = .01), being employed (IRR, 3.14; P = .03), and having a history of ulcerative sexually transmitted infections (IRR, 3.70; P = .009) or of polydrug use (IRR, 5.54; P = .01) independently predicted incident HCV.

Conclusions. In this cohort of HIV-infected men, a re-emerging HCV epidemic was observed from 2011 to 2014 among MSM. In addition to IDU, high-risk sexual behaviors, favorable socioeconomic status, and polydrug use fueled this increase in HCV infections.

Prevalence and correlates of neck injection among people who inject drugs in Tijuana, Mexico

INTRODUCTION AND AIMS

Injecting drugs in the neck has been related to adverse health conditions such as jugular vein thrombosis, deep neck infections, aneurysm, haematomas, airway obstruction, vocal cord paralysis and wound botulism, among others. We identified prevalence and correlates of neck injection among people who inject drugs (PWID) in Tijuana, Mexico.

DESIGN AND METHODS

Beginning in 2011, PWID aged ≥18 years who injected drugs within the last month were recruited into a prospective cohort. At baseline and semi-annually, PWID completed interviewer-administered surveys soliciting data on drug-injecting practices. Logistic regression was used to identify predictors of injecting in the neck as the most frequent injection site at a single visit.

RESULTS

Of 380 PWID, 35.3% injected in the neck at least once in the past 6 months, among whom 71.6% reported it as their most common injection site, the most common injecting site after the arms (47%). Controlling for age, years injecting and injecting frequency, injecting heroin and methamphetamine two or more times per day and having sought injection assistance were associated with injecting in the neck [adjusted odds ratios (AOR): 2.12; 95% confidence intervals (CI): 1.27-3.53 and AOR: 2.65; 95% CI: 1.52-4.53 respectively].

DISCUSSION AND CONCLUSIONS

Injecting in the neck was very common among PWID in Tijuana and was associated with polydrug use and seeking injection assistance. Tailoring harm reduction education interventions for individuals who provide injection assistance ('hit doctors') may allow for the dissemination of safe injecting knowledge to reduce injection-related morbidity and mortality.

Influence of different drugs on HIV risk in people who inject: systematic review and meta-analysis

AIMS

To assess systematically the risk of HIV acquisition by type of drug injected across different settings.

METHODS

A systematic review and meta-analysis were conducted. Databases were searched for studies of HIV incidence in people who inject different drugs (PWID). Pooled HIV incidence rate ratio (IRR) was used to compare HIV risk between injecting and not-injecting a given drug, when possible, or otherwise with those reported not to have injected the substance. Pooled estimates of crude IRR were derived using random-effects models. Variations in IRR were assessed in subgroup analyses, by drug and geographical region.

RESULTS

Of 5779 studies screened, 15 were included. HIV incidence was reported for people injecting cocaine (eight: North America, Europe), amphetamine-type stimulants (ATS) (four: Western and Eastern Europe, Asia), heroin (11: all settings), opiate-stimulants (four: North America, Western and Eastern Europe) and opiates-sedatives (five: Europe, Asia). HIV risk in cocaine injectors was 3.6 times 95% confidence interval (CI) = 2.8-4.7, I(2)  = 0%; n = 4) that of non-injectors and 3.0 for ATS injectors (95% CI = 2.2-4.1, I(2)  = 0%; n = 2). Higher sexual risk was reported in cohorts injecting stimulants. Compared to not-injecting, HIV IRR was 2.8 (95% CI = 1.7-4.7, I(2)  = 77%; n=6) for all heroin injectors and 3.5 (95% CI = 2.3-5.2, I(2)  = 40%; n=5) for heroin injectors in Asia and Europe.

CONCLUSION

The risk of HIV acquisition in people who inject drugs appears to vary by drug type but differences are not statistically significant, precluding conclusive grading of risk.

The Relationship between Methamphetamine Use and Dental Caries and Missing Teeth

PURPOSE

This study examined the relationship between methamphetamine use and oral health status.

METHODS

Using a cross-sectional design, data were collected in 1998 from 174 newly admitted prisoners in Iowa. Oral examinations identified dental caries and missing teeth, and personal interviews identified methamphetamine use and covariates. Descriptive statistics were used to summarize the data, and bivariate and multivariate linear regression analyses, including testing for interaction effects, were used to examine the effects of methamphetamine use on oral health status.

RESULTS

Multivariate regression analyses for carious teeth and surfaces showed significant interaction effects: methamphetamine*race/ethnicity (carious teeth: p=0.039; surfaces: p=0.023) and methamphetamine*tooth brushing when on drugs (carious teeth: p=0.044; surfaces: p=0.035). Methamphetamine use had a significant effect on dental caries among Non-Whites and among those who brushed their teeth less than once a day when on drugs. Soda consumption (carious teeth: p=0.026; surfaces: p=0.030) and reason for last dental visit (carious teeth: p=0.025; surfaces: p=0.011) were also associated with caries. For missing teeth there was a significant methamphetamine*race/ethnicity interaction (p=0.028) among Whites who used methamphetamine compared to Whites who did not use methamphetamine. Age (p=0.0001) and reason for last dental visit (p=0.0001) were also associated with missing teeth.

CONCLUSION

The effect of methamphetamine use on missing teeth was moderated by race/ethnicity,; while its effect on dental caries was moderated by race/ethnicity and tooth brushing when on drugs.

A longitudinal study of the association of adolescent polydrug use, alcohol use and high school non-completion

AIMS

Failure to complete high school predicts substantial economic and social disadvantage in adult life. The aim of this study was to determine the longitudinal association of mid-adolescent polydrug use and high school non-completion, relative to other drug use profiles.

DESIGN

A longitudinal analysis of the relationship between polydrug use in three cohorts at grade 9 (age 14-15 years) and school non-completion (reported post-high school).

SETTING

A State-representative sample of students across Victoria, Australia.

PARTICIPANTS

A total of 2287 secondary school students from 152 high schools. The retention rate was 85%.

MEASUREMENTS

The primary outcome was non-completion of grade 12 (assessed at age 19-23 years). At grade 9, predictors included 30-day use of eight drugs, school commitment, academic failure and peer drug use. Other controls included socio-economic status, family relationship quality, depressive symptoms, gender, age and cohort.

FINDINGS

Three distinct classes of drug use were identified-no drug use (31.7%), mainly alcohol use (61.8%) and polydrug use (6.5%). Polydrug users were characterized by high rates of alcohol, tobacco and cannabis use. In the full model, mainly alcohol users and polydrug users were less likely to complete school than non-drug users [odds ratio (OR) = 1.54, 95% confidence interval (CI) = 1.17-2.03) and OR = 2.51, 95% CI = 1.45-4.33), respectively, P < 0.001]. These effects were independent of school commitment, academic failure, peer drug use and other controls.

CONCLUSIONS

Mid-adolescent polydrug use in Australia predicts subsequent school non-completion after accounting for a range of potential confounding factors. Adolescents who mainly consume alcohol are also at elevated risk of school non-completion.

Underlying substance abuse problems in drunk drivers

OBJECTIVES

The aim of this study was to investigate polydrug use in drunk drivers.

METHODS

The experimental study was conducted on 2,072 drunk drivers undergoing a driving license reissue protocol at the Department of Legal Medicine of Padova University Hospital in the period between January 2011 and December 2012. The study protocol involved anamnesis, clinical examination, toxicological history, and toxicological analyses on multiple biological samples.

RESULTS

One thousand eight hundred seventy-seven subjects (90.6%) were assessed as fit to drive, and 195 (9.5%) were declared unfit. Among those unfit, 32 subjects (1.6%) were declared unfit due to recent use of an illicit drug (time span < 6 months), 23 (1.1%) spontaneously interrupted the protocol before its end, and 140 (6.8%) completed the assessment. Ineligibility to drive after completeness of the protocol was established in 1.2% of cases for alcohol disorders and in 5.7% of cases for illicit drug abuse; only one subject was included in both subgroups. Cocaine was the most widely used substance, followed by cannabis, opiates, and psychotropic pharmaceutical drugs.

CONCLUSIONS

The application of the protocol presented in this study allowed the identification of underlying polydrug use in drunk drivers. The study led to the identification of 6.8% unfit subjects on the basis of alcohol disorders and/or drug abuse, compared to 1.2% of identifiable unfitness if the protocol were limited to the mere assessment of alcohol consumption. The frequent association of alcohol and cocaine is different from other patterns of use in North Europe countries.

Simultaneous co-ingestion of prescription stimulants, alcohol and other drugs: a multi-cohort national study of US adolescents

OBJECTIVE

To determine the past-year prevalence rates and correlates of simultaneous co-ingestion of prescription stimulants and other substances among US high school seniors.

METHODS

Nationally representative probability samples of US high school seniors were surveyed as a part of the Monitoring the Future study. The sample consisted of five cohorts including a total of 12,431 high school seniors (modal age: 18 years) and represented a population that was 53% female.

RESULTS

Among past-year nonmedical users of prescription stimulants (n = 835), the estimated prevalence of any past-year simultaneous co-ingestion of prescription stimulants and other substances was 64.4%. The substances most commonly co-ingested with prescription stimulants included marijuana (51.1%) and alcohol (48.4%). Nonmedical users who co-ingested prescription stimulants with other substances were more likely to report non-oral routes of administration, recreational motives and greater subjective high when using prescription stimulants than nonmedical users who did not co-ingest prescription stimulants with other substances.

CONCLUSIONS

The majority of past-year nonmedical users of prescription stimulants reported simultaneous co-ingestion of prescription stimulants and other substances. The findings indicate that co-ingestion of prescription stimulants and other substances is a pervasive behavior among US adolescents who engage in nonmedical use of prescription stimulants and should be carefully considered in future clinical practice and research.

Patterns of drug use, risky behavior, and health status among persons who inject drugs living in San Diego, California: a latent class analysis

BACKGROUND

Among persons who inject drugs (PWID), polydrug use (the practice of mixing multiple drugs/alcohol sequentially or simultaneously) increases risk for HIV transmission and unintentional overdose deaths. Research has shown local drug markets influence drug use practices. However, little is known about the impact of drug mixing in markets dominated by black tar heroin and methamphetamine, such as the western United States.

METHODS

Data were collected through an ongoing longitudinal study examining drug use, risk behavior, and health status among PWID. Latent class analysis (LCA) was used to identify patterns of substance use (heroin, methamphetamine, prescription drugs, alcohol, and marijuana) via multiple administration routes (injecting, smoking, and swallowing). Logistic regression was used to identify behaviors and health indicators associated with drug use class.

RESULTS

The sample included 511 mostly white (51.5%) males (73.8%), with mean age of 43.5 years. Two distinct classes of drug users predominated: methamphetamine by multiple routes (51%) and heroin by injection (49%). In multivariable logistic regression, class membership was associated with age, race, and housing status. PWID who were HIV-seropositive and reported prior sexually transmitted infections had increased odds of belonging to the methamphetamine class. Those who were HCV positive and reported previous opioid overdose had an increased odds of being in the primarily heroin injection class (all P-values < .05).

CONCLUSION

Risk behaviors and health outcomes differed between PWID who primarily inject heroin vs. those who use methamphetamine. The findings suggest that in a region where PWID mainly use black tar heroin or methamphetamine, interventions tailored to sub-populations of PWID could improve effectiveness.

Polydrug Use and HIV Risk Among People Who Inject Heroin in Tijuana, Mexico: A Latent Class Analysis

BACKGROUND

Although most people who inject drugs (PWID) in Tijuana, Mexico, primarily inject heroin, injection and non-injection use of methamphetamine and cocaine is common. We examined patterns of polydrug use among heroin injectors to inform prevention and treatment of drug use and its health and social consequences.

METHODS

Participants were PWID residing in Tijuana, aged ≥18 years who reported heroin injection in the past six months and were recruited through respondent-driven sampling (n = 1,025). Latent class analysis was conducted to assign individuals to classes on a probabilistic basis, using four indicators of past six-month polydrug and polyroute use: cocaine injecting, cocaine smoking or snorting, methamphetamine injecting, and methamphetamine smoking or snorting. Latent class membership was regressed onto covariates in a multinomial logistic regression.

RESULTS

Latent class analyses testing 1, 2, 3, and 4 classes were fit, with the 3-class solution fitting best. Class 1 was defined by predominantly heroin use (50.2%, n = 515); class 2 by methamphetamine and heroin use (43.7%, n = 448), and class 3 by methamphetamine, cocaine, and heroin use (6.0%, n = 62). Bivariate and multivariate analyses indicated a group of methamphetamine and cocaine users that exhibited higher-risk sexual practices and lower heroin injecting frequency, and a group of methamphetamine users who were younger and more likely to be female.

CONCLUSIONS

Discrete subtypes of heroin PWID were identified based on methamphetamine and cocaine use patterns. These findings have identified subtypes of heroin injectors who require more tailored interventions to reduce the health and social harms of injecting drug use.

Alcohol and Relatively Pure Cannabis Use, but Not Schizotypy, are Associated with Cognitive Attenuations

Elevated schizotypy relates to similar cognitive attenuations as seen in psychosis and cannabis/polydrug use. Also, in schizotypal populations cannabis and polydrug (including licit drug) use are enhanced. These cognitive attenuations may therefore either be a behavioral marker of psychotic (-like) symptoms or the consequence of enhanced drug use in schizotypal populations. To elucidate this, we investigated the link between cognitive attenuation and cannabis use in largely pure cannabis users (35) and non-using controls (48), accounting for the potential additional influence of both schizotypy and licit drug use (alcohol, nicotine). Cognitive attenuations commonly seen in psychosis were associated with cannabis and alcohol use, but not schizotypy. Future studies should therefore consider (i) non-excessive licit substance use (e.g., alcohol) in studies investigating the effect of cannabis use on cognition and (ii) both enhanced illicit and licit substance use in studies investigating cognition in schizotypal populations.

The association of childhood physical abuse with the onset and extent of drug use among regular injecting drug users

AIMS

To determine whether childhood physical abuse (CPA) histories were associated with age of onset of psychoactive substance use and injecting, and the extent of polydrug use among injecting drug users (IDU).

DESIGN

Cross-sectional.

SETTING

Sydney, Australia.

PARTICIPANTS AND MEASUREMENTS

A total of 300 IDU were administered a structured interview examining the prevalence and severity of CPA and drug use histories.

FINDINGS

Of the participants, 40.3% had experienced severe abuse (SA), 34.0% mild-moderate abuse (MMA) and 25.7% no abuse history (NA). After controlling for other variables, a history of severe CPA was a significant independent correlate of an earlier age at first alcohol intoxication compared to both the NA (β = -0.23, P < 0.01) and MMA (β = 0.20, P < 0.01) groups. Severe CPA was also a significant independent correlate of an earlier age at first illicit drug use compared to both the NA (β = -0.16, P < 0.05) and MMA (β = -0.15, P < 0.05) groups. In contrast, CPA histories were not independently associated with the onset of injecting drug use. After controlling for potential confounders, both the MMA (β = 0.28, P < 0.001) and SA (β = 0.27, P < 0.001) groups were associated with more extensive life-time polydrug use, but did not differ from each other (P = 0.82). After controlling for potential confounders, both MMA (β = 0.20, P < 0.01) and SA (β = 0.33, P < 0.001) group membership were associated with more extensive recent polydrug use but, again, did not differ significantly from each other (P = 0.08).

CONCLUSIONS

Severe childhood physical abuse severity is associated with an earlier initiation into drug use. Any level of abuse is associated with more extensive life-time and recent polydrug use.

Concurrent and simultaneous polydrug use: latent class analysis of an Australian nationally representative sample of young adults

BACKGROUND

Alcohol use and illicit drug use peak during young adulthood (around 18-29 years of age), but comparatively little is known about polydrug use in nationally representative samples of young adults. Drawing on a nationally representative cross-sectional survey (Australian National Drug Strategy Household Survey), this study examines polydrug use patterns and associated psychosocial risk factors among young adults (n = 3,333; age 19-29).

METHOD

The use of a broad range of licit and illicit drugs were examined, including alcohol, tobacco, cannabis, cocaine, hallucinogens, ecstasy, ketamine, GHB, inhalants, steroids, barbiturates, meth/amphetamines, heroin, methadone/buprenorphine, other opiates, painkillers, and tranquilizers/sleeping pills. Latent class analysis was employed to identify patterns of polydrug use.

RESULTS

Polydrug use in this sample was best described using a 5-class solution. The majority of young adults predominantly used alcohol only (52.3%), alcohol and tobacco (34.18%). The other classes were cannabis, ecstasy, and licit drug use (9.4%), cannabis, amphetamine derivative, and licit drug use (2.8%), and sedative and alcohol use (1.3%). Young adult males with low education and/or high income were most at risk of polydrug use.

CONCLUSION

Almost half of young adults reported polydrug use, highlighting the importance of post-high school screening for key risk factors and polydrug use profiles, and the delivery of early intervention strategies targeting illicit drugs.

Perceived Drug Use Functions and Risk Reduction Practices Among High-Risk Nonmedical Users of Prescription Drugs

Nonmedical use of prescription drugs has become the fastest growing drug problem in the United States, particularly among young adults. This study examines the reasons young polydrug users misuse prescription drugs, and explores how young users employ risk reduction strategies to minimize adverse consequences. The sample was recruited during 2008 and 2009 in Los Angeles and New York, and comprised 45 nonmedical users of prescription drugs, aged 16 to 25. Data from a semistructured interview were analyzed quantitatively and qualitatively. Participants reported nonmedical use of prescription drugs to change mood, to facilitate activity, and to monitor the intake of other substances. Commonly employed risk reduction strategies included calculating pill timing, dosage, and access, and monitoring frequency of use, particularly when combining different substances. Most study participants often planned drug use to occur within socially acceptable parameters, such that prescription drug misuse was a normalized feature of their everyday lives.

Co-ingestion of prescription opioids and other drugs among high school seniors: results from a national study

BACKGROUND

The objective of this study was to determine the past-year prevalence rates and behavioral correlates of co-ingestion of prescription opioids and other drugs among high school seniors in the United States.

METHODS

Nationally representative probability samples of high school seniors in the United States were surveyed as a part of the Monitoring the Future (MTF) study. Data were collected in schools via self-administered paper-and-pencil questionnaires during the spring of each cohort's senior year. The sample consisted of five cohorts (senior years of 2002-2006) made up of 12,441 high school seniors (modal age 18), of which 53% were women.

RESULTS

The estimated prevalence of any past-year co-ingestion of prescription opioids and other drugs for these cohorts was 4.4%, and 69.8% among nonmedical users of prescription opioids. The substances most commonly co-ingested with prescription opioids included marijuana (58.5%), alcohol (52.1%), cocaine (10.6%), tranquilizers (10.3%), and amphetamines (9.5%). Nonmedical users who co-ingested prescription opioids with other drugs were more likely to report intranasal administration, recreational motives, oxycodone use, and greater subjective high when using prescription opioids than nonmedical users who did not co-ingest prescription opioids and other drugs.

CONCLUSIONS

Nearly 7 out of every 10 nonmedical users of prescription opioids reported co-ingestion of prescription opioids and other drugs in the past year. The findings indicate that the co-ingestion of prescription opioids and other drugs by high school seniors in the United States serves as a marker for substance abuse and represents a significant public health concern.

An Exploration of the Relationship between the Use of Methamphetamine and Prescription Drugs

This study examines patterns of use of prescription drugs and methamphetamine. We drew our sample from a study about 130 active and inactive methamphetamine users and focused on 16 participants with a recent history of methamphetamine and prescription drug use. We collected in-depth interviews to explore relationships in use trajectory patterns. The qualitative methods we used in this study followed the constant comparison process developed by grounded theory methods and analytical ethnography, which is based on familiarity with the social setting and developing propositions while conducting a research study. We used a triangulation of methods and analysis and included qualitative data, such as participant observation notes and in-depth interviews, as well as quantitative data that we collected in drug history matrices. Five themes emerged from the coding of the interview transcripts: (1) sequential polydrug use; (2) concurrent polydrug use (3) temporary substitution of preferred drug; (4) consequential-based use; and (5) switching from using methamphetamine to using prescription drugs. The trajectory patterns of methamphetamine and prescription drug use complicates treatment significantly.

Understanding subtypes of inner-city drug users with a latent class approach

AIMS

We empirically identified subtypes of inner-city users of heroin and cocaine based on type of drug used and route of administration.

METHOD

The sample was recruited from the communities in Baltimore, MD (SHIELD study) and consisted of 1061 participants who used heroin and or cocaine in the past 6 months on a weekly basis or more. Latent class analysis (LCA) was used to identify subtypes of drug users based on type of drug and route of administration. Logistic regression was used to compare the subtypes on depressive symptoms, injection risk and drug network compositions.

FINDINGS

Inner-city drug users were classified into five subtypes: three subtypes of injection drug users (IDUs) [heroin injecting (n=134; 13%), polydrug and polyroute (n=88, 8%), and heroin and cocaine injecting (n=404, 38%)], and two subtypes with low proportions of IDUs (LIDUs) [heroin snorting (n=275, 26%) and crack smoking (n=160; 14%)]. The polydrug and polyroute subtype had the highest depressive symptoms risk among all subtypes. Injection risk was lowest in the heroin injecting subtype and significantly differed from heroin and cocaine injecting subtype. The IDU subtypes also varied in the drug network compositions. The LIDU subtypes had similar depressive symptoms risk but vastly differed in the drug network compositions.

CONCLUSIONS

Subgroups of inner-city cocaine and heroin users based on type and route of administration differed in their depressive symptoms, injection risk and drug network compositions. Future studies should longitudinally examine factors associated with transitioning across these subtypes to better inform prevention and treatment efforts.

During pregnancy, recreational drug-using women stop taking ecstasy (3,4-methylenedioxy-N-methylamphetamine) and reduce alcohol consumption, but continue to smoke tobacco and cannabis: initial findings from the Development and Infancy Study

While recreational drug use in UK women is prevalent, to date there is little prospective data on patterns of drug use in recreational drug-using women immediately before and during pregnancy. A total of 121 participants from a wide range of backgrounds were recruited to take part in the longitudinal Development and Infancy Study (DAISY) study of prenatal drug use and outcomes. Eighty-six of the women were interviewed prospectively while pregnant and/or soon after their infant was born. Participants reported on use immediately before and during pregnancy and on use over their lifetime. Levels of lifetime drug use of the women recruited were high, with women reporting having used at least four different illegal drugs over their lifetime. Most users of cocaine, 3,4-methylenedioxy-N-methylamphetamine (MDMA) and other stimulants stopped using these by the second trimester and levels of use were low. However, in pregnancy, 64% of the sample continued to use alcohol, 46% tobacco and 48% cannabis. While the level of alcohol use reduced substantially, average tobacco and cannabis levels tended to be sustained at pre-pregnancy levels even into the third trimester (50 cigarettes and/or 11 joints per week). In sum, while the use of 'party drugs' and alcohol seems to reduce, levels of tobacco and cannabis use are likely to be sustained throughout pregnancy. The data provide polydrug profiles that can form the basis for the development of more realistic animal models.

Controlled release: a cultural analysis of collegiate polydrug use

Social science research on polydrug use among young adult college students is scant, adopts definitions of this practice that are often devoid of sociocultural context, and emphasizes a very narrow range of use patterns. This article, based on ethnographic interviews from a study of collegiate prescription drug misuse, expands this focus by offering a cultural analysis of polydrug use. Two specific types of collegiate polydrug use, simultaneous interaction and sequential management, are examined within a cultural framework that relates these practices to the expression of two complementary values--control and release. The college experience provides young people with a culturally sanctioned "time-out" period that affords freedom from many of the roles, responsibilities, and other constraints that come to structure later adult life. At the same time, college students are expected to meet academic and social demands that require organization, initiative, and direction. Specific types of polydrug use provide young adults with a means to navigate these competing prescriptions that are characteristic of contemporary college life.

Sexual risk behavior associated with co-administration of methamphetamine and other drugs in a sample of HIV-positive men who have sex with men

This study examined the association between sexual risk behavior and co-administration of methamphetamine with other drugs in a sample of 341 HIV-positive MSM. Those who reported methamphetamine co-administration in the past two months (65%) reported significantly more unprotected anal and oral sex and a greater number of casual, anonymous, and paid sex partners in this timeframe compared to men who used methamphetamine alone. Two primary patterns of co-administration were identified: 1) drug combinations motivated by sexual performance and enhancement (eg, methamphetamine, poppers, sildenafil); and 2) "party drug" combinations (eg, methamphetamine, GHB, ketamine). Implications for further research and possible applications to risk-reduction interventions are discussed.