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(LSD) for Alcoholism: Meta-Analysis of Randomized Controlled Trials

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(LSD) for Alcoholism: Meta-Analysis of Randomized Controlled Trials JOP0010.1177/0269881112439253Krebs and JohansenJournal of Psychopharmacology 4392532012 Review Lysergic acid diethylamide (LSD) for alcoholism: meta-analysis of randomized controlled trials Journal of Psychopharmacology 0(0) 1 –9 © The Author(s) 2012 Reprints and permission: sagepub.co.uk/journalsPermissions.nav 1,2 1,2 DOI: 10.1177/0269881112439253 Teri S Krebs and Pål-Ørjan Johansen jop.sagepub.com Abstract Assessments of lysergic acid diethylamide (LSD) in the treatment of alcoholism have not been based on quantitative meta-analysis. Hence, we performed a meta-analysis of randomized controlled trials in order to evaluate the clinical efficacy of LSD in the treatment of alcoholism. Two reviewers independently extracted the data, pooling the effects using odds ratios (ORs) by a generic inverse variance, random effects model. We identified six eligible trials, including 536 participants. There was evidence for a beneficial effect of LSD on alcohol misuse (OR, 1.96; 95% CI, 1.36–2.84; p = 0.0003). Between-trial heterogeneity for the treatment effects was negligible (I² = 0%). Secondary outcomes, risk of bias and limitations are discussed. A single dose of LSD, in the context of various alcoholism treatment programs, is associated with a decrease in alcohol misuse. Keywords Alcoholism, alcohol-related disorders, hallucinogens, meta-analysis, psychedelics, substance-related disorders Introduction results by reading the titles and abstracts. We retrieved each potentially relevant publication located in the search and assessed Alcohol is said to cause more overall harm than any other drug it for inclusion, subsequently examining the reference lists of eli- (Nutt et al., 2010). Alcohol contributes to about 4% of total mor- gible studies and relevant review articles. We supplemented our tality and about 5% of disability adjusted life-years to the global search for trials by contacting experts. If publications lacked burden of disease (Rehm et al., 2009). Despite the often extreme important information, we attempted to contact study investiga- individual and social consequences of alcohol misuse, many users tors and institutions. find it challenging to stop drinking. Alcoholism, also called alco- We specified inclusion and exclusion criteria and defined pri- hol dependence, continues to be difficult to treat, and many mary and secondary outcomes in the meta-analysis study proto- patients do not achieve recovery from existing treatments col. We included randomized controlled trials of LSD for (Schuckit, 2009). alcoholism, in which control condition involved any type of treat- Numerous clinical investigators have claimed that treating ment, including doses of up to 50 mcg LSD as an active control. If alcoholics with individual doses of lysergic acid diethylamide a trial included multiple randomized treatment arms, all partici- (LSD), in combination with psychosocial interventions, can help pants in the eligible LSD arms and all participants in the eligible to prevent a relapse of alcohol misuse, for example, by eliciting control arms were pooled for analysis. We excluded participants insights into behavioural patterns and generating motivation to with schizophrenia or psychosis from analysis, as psychosis is build a meaningful sober lifestyle (Dyck, 2008). LSD is well- recognized as a contraindication for treatment with LSD (Johnson known for inducing spectacular and profound effects on the mind et al., 2008; Passie et al., 2008). (Henderson and Glass, 1994; Passie et al., 2008). It has previously been used in standard treatment programs for alcoholism at many clinics, but, unfortunately, assessments of the clinical value of Data extraction LSD have not been based on formal systematic review and meta- Both reviewers independently extracted data and rated the risk of analysis (Mangini, 1998). Hence, we have performed a quantita- bias of each included trial. Differences between the reviewers tive evaluation of the effectiveness of LSD for alcoholism, based were resolved through discussion. The following were recorded on data from randomized controlled clinical trials. Methods 1 Department of Neuroscience, Faculty of Medicine, Norwegian University of Science and Technology (NTNU), Trondheim, Norway Search strategy and selection criteria 2 Department of Psychiatry, Harvard Medical School, Boston, MA, USA We searched the PubMed and PsycINFO databases (1943–2010), Corresponding author: without language restrictions, using the following terms: LSD, Pål-Ørjan Johansen, Department of Neuroscience, Faculty of Medicine, lysergic, lysergide, psychedelic*, or hallucinogen*; and alcohol*, NTNU, N-7489 Trondheim, Norway addict*, or dependence. We independently inspected the search Email: [email protected] 2 Journal of Psychopharmacology 0(0) from each trial where available: intervention characteristics (LSD dose, control condition, additional treatments); participant charac- 4275 records identified through 6 additional records identified database searching through other sources teristics (number, gender, age, inclusion and exclusion criteria); information given to the participants on the study and the effects of LSD; trial characteristics (publication year, location, funding 4158 records screened after source); outcomes (primary and secondary outcomes, time of duplicates removed follow-up, method of outcome assessment); evaluation of each domain of the Cochrane risk of bias assessment tool (sequence generation, allocation concealment, blinding, incomplete out- 4090 records excluded based on titles or come data, selective outcome reporting) (Higgins and Altman, abstracts 2008). Primary outcomes were alcohol misuse, defined as alcohol 68 records flagged for detailed 59 records excluded: use or consequences of alcohol use, as systematically measured assessment 18 open-label or case by interview or self-report at the first reported follow-up. reports Secondary outcomes were alcohol misuse at short-term (approxi- 6 non-randomized mately 3 months), medium-term (approximately 6 months) and (5 trials) 5 quasi-randomized long-term (approximately 12 months) follow-up. We also (1 trial) extracted data on abstinence, reports of adverse events and any 7 randomized, but no other secondary outcomes. extractable outcome data (3 trials) 23 reviews or other Data analysis 9 records included in meta-analysis (6 trials) Categorical data on alcohol misuse were dichotomized into ‘improved’ or ‘not improved’. We counted as ‘improved’ outcome categories indicating clear, substantial improvement in alcohol Figure 1. Selection of trials for meta-analysis. misuse. Dichotomous and continuous outcome data were pooled using the generic inverse variance method with a random effects model. We calculated the effects of intervention results with esti- controlled trials without any outcome data related to alcohol use mates of pooled odd ratios (ORs) and 95% confidence intervals (both measured only general psychological variables) (Denson (CI) using Review Manager 5.0 (Nordic Cochrane Centre, and Sydiaha, 1970; Ditman et al., 1970), and one randomized con- Cochrane Collaboration). The percentage of outcome heterogene- trolled trial without extractable outcome data on alcohol misuse ity attributable to between-trial heterogeneity was assessed by the (this trial reported only ‘no statistically significant difference’ I2 statistic. Participants lost to follow-up were counted as not between LSD and control groups on alcohol misuse at 12 months improved. In a post hoc analysis of trials with available dichoto- follow-up) (Johnson, 1969). mized data, we calculated the pooled benefit difference on The six eligible trials included a total of 536 adults; of these improvement in alcohol misuse at first follow-up and also calcu- 325 (61%) had been randomly assigned to receive full-dose LSD lated the number needed to treat. The benefit difference (also and 211 (39%) to a control condition. Participants were male in- known as the risk difference) for each trial is the percentage of patients, except for two females and a small number of day-care improved patients in the LSD group minus the percentage of patients in one of the trials (Smart et al., 1966). All participants improved patients in the control group. The number needed to were seeking treatment for ‘alcoholism’ as their primary problem treat is the inverse of the pooled benefit difference and provides an and had been admitted to alcohol-focused treatment programs estimate of the average number of patients needed to be treated before clinical trial recruitment, see Table 1. Note, the DSM-I with LSD rather than without LSD to achieve one additional defined alcoholism as a ‘well established addiction to alcohol patient with improved outcome on alcohol misuse. without recognizable underlying disorder’ (American Psychiatric Association, 1952). Among the reported exclusion criteria, trials excluded poten- Results tial volunteers with ‘psychiatric complications’ (Bowen et al., Description of studies 1970), with a ‘past history of schizophrenic reaction or severe affective disorder’ (Hollister et al., 1969), or overt psychosis We identified six eligible randomized controlled trials (Bowen et (Ludwig et al., 1969; Smart et al., 1966; Tomsovic and Edwards, al., 1970; Hollister et al., 1969; Ludwig et al., 1969; Pahnke et al., 1970). One trial included a subgroup of patients with schizophre- 1970; Smart et al., 1966; Tomsovic and Edwards, 1970), including nia (Tomsovic and Edwards, 1970), which we excluded from the additional reports on three
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