Abstract
Purpose of Review
This review summarizes recent clinical trial research on pharmacological treatments for substance use disorders, with a specific focus on agents with potential abuse liability.
Recent Findings
Pharmacological treatments for substance use disorders may include gabapentinoids, baclofen, modafinil, ketamine, cannabinoids, gamma-hydroxybutyrate, and psychedelics. Gabapentinoids may decrease negative subjective effects of withdrawal in alcohol and cannabis use disorders. Cannabinoids similarly appear to decrease use and withdrawal symptoms in cannabis use disorder, while research shows stimulant medications may reduce cravings and increase abstinence in cocaine use disorder. Ketamine and psychedelics may help treat multiple substance use disorders. Ketamine may reduce withdrawal symptoms, promote abstinence, and diminish cravings in alcohol and cocaine use disorders and psychedelics may promote remission, decrease use, and reduce cravings in alcohol and opioid use disorders.
Summary
Regardless of current regulatory approval statuses and potentials for abuse, multiple agents should not be dismissed prematurely as possible treatments for substance use disorders. However, further clinical research is needed before effective implementation can begin in practice.
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Introduction
Many US individuals experience substance use disorders (SUDs) [1]. According to the 2020 National Survey of Drug Use and Health (NSDUH), 40.3 million people aged 12 years or older had an SUD. While statistics for use of alcohol or cocaine have remained relatively stable, use of drugs such as cannabis and methamphetamines have shown upward trends recently. In addition, and compounded by the COVID-19 pandemic, the rate of drug-related overdoses increased by 15.7% from 2019 to 2020, reaching an all-time 12-month high of 100,000 + deaths as of December 2021 [2].
These statistics underscore a need for new or better interventions for SUDs. While previous reviews have summarized the development of treatments [3,4,5], these reviews have either focused on a specific SUD, a single treatment, or a specific neurobiological target or pathway. One theme that emerges from prior reviews is the potential abuse liability inherent to some pharmacological candidates (i.e., substitution approaches such as methadone, buprenorphine, or stimulants). While an important consideration, once a drug is labeled as having potential abuse liability, its consideration as a possible treatment option is often dismissed by clinical practitioners. For example, because of their varying degrees of possible abuse liability, gabapentin [6, 7], pregabalin [8], baclofen [9, 10], and bupropion [11] may not be routinely used generally by some practitioners when treating SUDs, despite the frequent use of these agents in clinical practice.
In the present narrative review, we describe potential pharmacological treatments for the most prevalent SUDs and specifically focus on drugs with potential abuse liability. The review examines recent clinical trials for treatment of alcohol, cannabis, cocaine, and opioid use disorders. For each SUD, research on specific drugs with potential abuse liability is described, and followed by discussion of the evidence for and against clinical implementation of the treatments.
Methods
A literature search was conducted by searching the following databases on the Ovid platform: MEDLINE, Embase, and PsycInfo. Searches were limited to English language articles from the last 15 years. A librarian was consulted, and a precise textword search strategy was created so that relevant articles were retrieved. The textword search strings included terms for the drugs of abuse and their treatments of interest. In addition, the search was limited to clinical trials, systematic reviews, and meta-analyses using a modified version of the Cochrane Highly Sensitive Search Strategy. (See Supplementary Information for search strategies for all databases.)
The final search retrieved a total of 2255 articles, which were pooled in EndNote and deduplicated [www.endnote.com]. The set of 1300 citations was uploaded to a Google Spreadsheet and tagged by each substance described in the article. Team members screened the title and abstract and determined whether to include or exclude the article based on relevance and whether or not study was a clinical trial. The full text of articles initially deemed potentially suitable was re-reviewed by one team member to determine inclusion in analyses. Articles published within the last 5 years were prioritized for inclusion in the review (Fig. 1).
The selection process of the articles included in the narrative review. After deduplication of articles found in the initial search, 1300 articles were reviewed by the authors. Of the initially selected articles, 199 met initial inclusion criteria and were reviewed again by one author. Articles within the last 5 years were prioritized for final inclusion, and 94 articles were deemed appropriate for inclusion in the review. Of note, baclofen as a potential treatment for AUD has been studied significantly more than the other pharmacological agents reviewed here. Due to its over-representation, 16 studies from 2017 to 2018 were further excluded from the final review
Alcohol Use Disorder (AUD)
Baclofen
A GABAB agonist hypothesized to modulate the mesolimbic reward system [12, 13•], baclofen has been reported to have some abuse liability [10]. Baclofen has been studied as a candidate treatment for AUD. Studies have demonstrated mixed results, with some finding baclofen a safe and effective intervention for abstinence promotion and maintenance [14], and others finding no significant difference between baclofen and placebo across a spectrum of end-points [15]. In the 2015 BACLAD study, 56 AUD participants were randomized to a double-blind treatment of either individually titrated baclofen (30–270 mg total daily dose) or placebo, and followed over the course of a 12-week “high dose” phase for effect on alcohol abstinence. Participants treated with baclofen were found to be significantly more likely to maintain abstinence from alcohol than those treated with placebo (15/22, 68.2% vs. 5/21, 23.8%, p = 0.014) [16]. The 2017 ALPADIR study attempted to replicate the BACLAD results, randomizing 320 AUD patients to either placebo (n = 162) or high-dose baclofen (n = 158, titration to baclofen 180 mg total daily dose maintenance). However, at the end of the 6-month study period, the authors observed no effect on abstinence. Notably, they observed a significant reduction in alcohol craving (p = 0.017) and consumption (p = 0.003) [17,18,19]. Follow-up analysis from the BACLAD group established that among subjects with alcoholic liver disease, baclofen increased both time to lapse and relapse, as well as percentage days abstinent (number needed to treat = 8.3) [20]. The authors further identified that high baseline alcohol consumption served as a positive predictor of baclofen’s benefit in AUD subjects [21]. Neuroimaging of alcohol cue-elicited functional activation in treatment-seeking individuals with AUD found that high dose (75 mg/day) baclofen was associated with decreased bilateral caudate nucleus and dorsal anterior cingulate activation in response to alcohol cues, and that deactivation of these areas was positively correlated with decreased heaving drinking days [22].
Gabapentinoids
Gabapentin, a GABA analogue, acts to potentiate GABA in the central nervous system [23], inhibit both glutamate synthesis and the functioning of sodium channels, modulate the alpha-2-delta subunit of voltage-gated calcium channels, and reduce the release of both dopamine and norepinephrine. Gabapentin has been reported to be abused, and such abuse may contribute to overdose deaths [6, 7]. The first full-scale 12-week, randomized, double-blind, placebo-controlled trial of gabapentin involving 150 AUD adults found significant effects of gabapentin when compared to placebo, including elimination of heavy drinking and 12-week abstinence [24]. Specifically, the authors found that 1800 mg total daily dose had positive effects on abstinence (number needed to treat = 8, OR = 4.8), heavy drinking (number needed to treat = 5, OR = 2.8), decreases in average number of heavy drinking days per week, and total number of drinks consumed per week, compared to placebo. These effects were sustained at the study’s Week 24 follow-up encounter [24]. Similarly, a more recent study of 40 participants with AUD found that high-dose gabapentin (3600 mg/day) was associated with decreased number of heavy drinking days (p = 0.002) and increased percentage of days abstinent (p = 0.004) [25].
A separate randomized double-blind placebo-controlled study of 232 participants found no significant difference between extended-release gabapentin and placebo, hypothesizing that these results followed from any of several factors, including inadequacy of dosing, bioavailability of active drug in the setting of both alcohol use and suboptimal diet, and lack of nuance in the analysis [26]. In a randomized double-blind placebo-controlled trial of 44 participants treated with gabapentin, 12 (27%) reported no heavy-drinking days, as compared to 4 of the final 46 participants (9%) in the placebo group. Furthermore, 18% of gabapentin recipients reported total abstinence throughout the treatment period, as compared to 4% of placebo recipients. The authors qualified their results by noting that gabapentin produced stronger effects in participants with “high” withdrawal symptoms [27•].
Like gabapentin, pregabalin is a GABA analogue that may be abused. Pregabalin specifically binds to α2-δ1 and α2-δ2 calcium channel sub-units that attenuate the downstream release of excitatory neurotransmitters. Pregabalin is used to treat neuropathic pain, anxiety, and panic disorders, and has been studied for AUD. Following alcohol detoxification, individuals with AUD treated with pregabalin 150 mg daily in an outpatient treatment setting had higher retention in treatment (9.1 + / − 0.5 weeks) compared to placebo (7.1 + / − 0.5 weeks) [28]. Furthermore, individuals treated with pregabalin had decreased alcohol consumption, fewer heavy drinking days, and higher rates of abstinence. A meta-analysis by Cheng et al. found similar results in that pregabalin and gabapentin decreased percentage of heavy drinking (p = 0.0441) and symptoms of alcohol withdrawal (0.0425), compared to placebo [29••].
Ketamine
Ketamine is a commonly used clinical analgesic that has had increasing popularity as a recreational “club drug” since the 1990s. The precise mechanism of ketamine is not fully understood; however, NMDA antagonism may underlie its therapeutic benefit, similar to preclinical evidence from other NMDA antagonists [30]. As such, effects of ketamine may operate through glutamate systems that may be targeted in SUDs through multiple compounds including modulating drugs (e.g., mavoglurant) and nutraceuticals (e.g., n-acetyl cysteine). The effects of ketamine may extend beyond the glutamate system, with studies showing intravenous (IV) ketamine as an effective treatment for co-occurring AUD and major depressive disorder (MDD) or PTSD [31••]. In combination with 5 weeks of motivational enhancement therapy (MET), single-dose IV ketamine has also been found to significantly increase abstinence from alcohol, delay relapse and lower the likelihood of heavy drinking in AUD [32]. Furthermore, 3 ketamine infusions in combination with psychotherapy was found to significantly increase abstinence for 6 months following the last therapy session in individuals with AUD [33]. More acutely, ketamine infusions have also been found to reduce mean benzodiazepine (BZD) requirements for alcohol withdrawal [34]. Among patients with severe alcohol withdrawal symptoms and delirium tremens, those who were treated with IV ketamine at 0.15–0.3 mg/kg/h were less likely to be intubated and experience shorter intensive-care treatments [35].
Sodium Oxybate/GHB
Another “club drug,” gamma-hydroxybutyric acid (GHB), or its sodium salt (sodium oxybate), is a partial agonist of GABAB receptors [36]. Low doses of GHB can induce ethanol-like effects [37] and may compete for extra-synaptic GABAB receptors, suggesting a potential role for GHB in treating AUD [36]. Between 30 and 66% of GHB-treated AUD patients maintained total abstinence 3 months after drinking cessation [38]. Reviews in the last 5 years have noted alcohol-abstinence rates 34% higher for GHB treatment than for placebo [36] and reductions in alcohol consumption associated with GHB even if total abstinence was not achieved [39]. Additionally, GHB may be as effective as disulfiram and naltrexone (NTX) in the maintenance of abstinence in AUD [4, 40]. GHB may be particularly effective in preventing relapse associated with heavy drinking [41, 42]. Despite these potential benefits, GHB has a severe risk of intoxication and death when abused. However, to date, there has been no published data about related deaths when used for treatment of AUD. Clinical trials have had limited adverse events, with instances of abnormal cravings and abuse rare and limited to patients with co-occurring psychiatric conditions [39, 43], and these may constitute risk factors for craving and abuse of GHB [25].
Psychedelics
Psychedelics (a.k.a. hallucinogens or entheogens) are a class of psychoactive drugs whose primary mechanism of action may involve binding and activation of the 5-HT2a receptor [44••, 45]. “Classic” psychedelics include lysergic acid diethylamide (LSD), psilocybin and its metabolite psilocin, dimethyltryptamine (DMT), and mescaline. Synthetic compounds exist, as well as ibogaine, an indole alkaloid, and 3,4-Methylenedioxymethamphetamine (MDMA or “molly”), a reuptake inhibitor at serotonin, dopamine and norepinphrine transporters, may be considered psychedelics given their subjective effects. The potential therapeutic use of psychedelics has been investigated for multiple psychiatric conditions including SUDs [46,47,48]. Thorough reviews of the literature of psychedelics in the treatment of SUDs have been previously published, with most finding that efficacy data, while promising, are limited due to the difficulty in researching these substances until very recently [49,50,51]. A meta-analyses of early studies of LSD for AUD found that following LSD administration, 59% of participants were significantly improved at 1 month post-LSD follow-up and alcohol use remained significantly decreased at 6-month follow-up, compared to decreased use in only 38% of control participants [52]. A survey of individuals with AUD found that following non-clinical psychedelic use, 83% reported no longer meeting AUD criteria [53]. Most participants described taking moderate-to-high doses of either LSD (38%) or psilocybin (36%), and reported that the experience facilitated their alcohol-use reduction by changing their life priorities or values. An open-label study among 10 AUD participants undergoing MET showed positive gains on abstinence, which were present at 36-week follow-up [54]. Despite the promising therapeutic effects of psychedelics, clinical trials for AUD are lacking.
MDMA-assisted psychotherapy has also been found to decrease alcohol consumption [55]. In one preliminary study, fourteen participants with AUD completed two sessions of MDMA-assisted psychotherapy and showed decreased alcohol consumption at 1 month follow-up (0.1 units of alcohol compared to 130.6 units of alcohol prior to MDMA therapy). The decrease in alcohol use was still significant at 9-month post-treatment, with participants drinking 18.7 units of alcohol on average, and nine of fourteen participants remaining completely abstinent.
Clinical Implementation
Recent studies of AUD treatment offer multiple options with varying degrees of clinical applicability. While baclofen showed initial promise, evidence for baclofen use in AUD appears increasingly constrained to specific-use cases. The most recent studies suggest that baclofen has the greatest benefit at higher doses, works best on craving, and works best for men with high baseline alcohol consumption [56], and perhaps particularly for those with alcoholic liver disease [57]. Given these limited applications for baclofen, and in light of the potential for both abuse [58] and overdose [20], it is challenging to advocate for baclofen as an early therapeutic intervention in AUD treatment.
Data support the use of gabapentinoids in AUD patients [59]. Gabapentin typically is well-tolerated, carries relatively low risk of adverse effects, helps with sleep disruption, and shows benefit in withdrawal and adjunctive benefit in anxiety. While gabapentin may be best suited for patients with high withdrawal-risk histories, co-occurring insomnia/anxiety, and possible concurrent treatment with naltrexone, it may provide enough benefit to shift cost–benefit analyses towards use in many patients. Similarly, pregabalin may decrease heavy drinking and alcohol withdrawal. Even at doses as high as 600 mg/day, adverse effects are relatively uncommon, with the most common being drowsiness [60]. Thus, the potential benefit of pregabalin in AUD largely outweighs the risks. As such, gabapentinoids are useful adjunctive medications for AUD treatment.
Ketamine and GHB offer promise in treating AUD. Both may increase abstinence, decrease drug use, and reduce feelings of craving. Ketamine may be particularly beneficial for individuals with histories of severe withdrawal [35]. However, both are limited by the need for more clinical trial data. Both ketamine and GHB may result in serious adverse consequences, including death, if used improperly. Logistical challenges for implementation such as supervised IV administration of ketamine, and standardized protocol for monitoring patient status must therefore also be addressed before being implemented successfully.
Like ketamine and GHB, early evidence suggests that psychedelics reduce cravings, decrease alcohol use, and may increase abstinence. Unlike ketamine and GHB, psychedelics are generally less addictive and relatively safe in terms of physical symptoms. Because of the intensity of the acute psychedelic experience, effective blinding during clinical trials is difficult if not impossible. Additionally, there is question whether traditional clinical trial protocols can effectively capture all of the factors contributing to psychedelic treatment outcomes. Finally, although grouped together in this review as “psychedelics,” research on AUD has been limited to LSD, MDMA, and recently psilocybin, which may have varying requirements for dosing supervision, harm potential, and efficacy in treating AUD. Thus, while these drugs may offer considerable potential for AUD treatment, significantly more research is needed before they may be implemented clinically.
Cannabis Use Disorder (CbUD)
Cannabinoid Agonists: Dronabinol and Nabilone
Currently, there are no medications approved by the Food and Drug Administration (FDA) to treat CbUD. The first cannabinoid agonist investigated for CbUD was dronabinol — an oral, synthetic formulation of tetrahydrocannabinol (THC) that is approved by the FDA (1) to treat chemotherapy-induced nausea; and, (2) to stimulate appetite among persons with HIV-related anorexia. A small (n = 14) placebo-controlled crossover study found that dronabinol significantly reduced self-administration of cannabis and suppresed withdrawal symptoms [61]. However, data from other phase 2 human laboratory studies and clinical trials suggest that while dronabinol may alleviate symptoms of cannabis withdrawal, it may not promote abstinence or reduce cannabis use [62,63,64,65].
Following dronabinol, the second cannabinoid agonist to be investigated for CbUD was nabilone, another THC analogue FDA-approved to treat nausea. Like dronabinol, nabilone (administered solo or in combination with zolpidem) reduced symptoms of cannabis withdrawal in human laboratory studies [66, 67, 68•]. Unlike dronabinol, nabilone also reduced cannabis self-administration in the laboratory, following a period of abstinence [66]. A 10-week randomized, placebo-controlled pilot clinical trial found that nabilone was safe and well-tolerated by persons with CbUD, but evidenced no difference in cannabis use between the nabilone and the placebo groups [69].
Nabiximols
Some of the other 70 currently known plant-based cannabinoids may also modify THC use. For example, cannabidiol (CBD), the second most abundant cannabinoid after THC, may have anxiolytic and neuroprotective effects that offset THC-induced anxiety and cognitive deficits [70]. In the first placebo-controlled trial testing the therapeutic efficacy of nabiximols, symptoms of cannabis withdrawal were reduced; however, there was no difference in cannabis use between the treatment and placebo groups [71]. In a subsequent pilot randomized, placebo-controlled clinical trial, nabiximols were examined in conjunction with MET and Cognitive Behavioral Therapy (CBT) among treatment-seeking persons with CbUD [72]. At 12-week follow-up, there was no difference in abstinence rates between the nabiximols and the placebo group; still, despite the absence of statistically significant differences in cannabis withdrawal scores, nabiximols appeared to reduce cannabis use, compared to placebo (70.5% vs. 42.6%). Finally, a multicenter randomized, placebo-controlled clinical trial tested the therapeutic efficacy of nabiximols, in conjunction with CBT-based counseling, among treatment-seeking persons with CbUD [73••]. This 12-week trial found that participants who received nabiximols reported significantly fewer days of cannabis use, without significant differences in adverse effects for up to 3 months following completion of nabiximols treatment [74].
Gabapentinoids
Gabapentin has also been tested to treat CbUD. One proof-of-concept 12-week randomized, placebo-controlled clinical trial examined effects of gabapentin among treatment-seeking persons with CbUD [75]. Compared to placebo, gabapentin (1200 mg/day) attenuated cannabis withdrawal and reduced cannabis use. Additionally, compared with participants who received placebo, participants who received gabapentin had better executive functioning and less negative affect. These cognitive/emotional effects may be due in part to gabapentin-induced changes to glutamate levels in the basal ganglia and activation of the posterior midcingulate cortex [76]. Pregabalin (300 or 450 mg/day) has also been studied as treatment for CbUD; however, no significant differences in use or remission were observed between pregabalin and placebo groups [77].
Ketamine
A recent small (n = 8) proof-of-concept trial found that IV infusion of ketamine (0.71 mg/kg or 1.41 mg/kg for non-responders) paired with MET and mindfulness-based relapse prevention significantly decreased and sustained reduced cannabis use for 6 weeks following infusion [78].
Clinical Implementation
Cannabinoid agonist treatments have been used to treat cannabis withdrawal syndrome, which is a recognized entity in the DSM-5 [63]. However, withdrawal suppression is typically not associated with improved long-term outcomes in the treatment of CbUD. Given their higher tolerability and likely lower abuse potential, nabiximols may hold particular therapeutic promise [79].
Taken together, evidence indicates that cannabinoid agonists may reduce withdrawal and cannabis use, but thus far there are no data indicating that they promote abstinence. Although there are early signs of efficacy for nabiximols, the dose-dependent efficacy of nabilone for CbUD remains to be tested in well-powered clinical trials.
There is preliminary evidence regarding the efficacy of gabapentin to reduce cannabis withdrawal and associated disruptions in sleep architecture. Although when compared to cannabinoid agonists, gabapentin is more widely used and generally perceived to have lower abuse liability, to our knowledge there are no drug discrimination studies comparing the abuse potential of these compounds among persons with CbUD.
Initial preliminary results of ketamine paired with behavioral therapy may decrease cannabis use. However, given that there was no control group, the therapeutic effects of ketamine vs. behavioral therapy cannot be ascertained, and larger placebo-controlled studies are needed.
While medications with lower abuse potential are in development, the efficacy and abuse potential of the existing medications may depend on the severity of CbUD and other clinical factors, such as the presence of other psychiatric disorders. Future research should investigate how to maximize therapeutic benefit while reducing abuse potential.
Cocaine Use Disorder (CUD)
Baclofen
CUD lacks an FDA-approved treatment. While research on baclofen as a potential therapeutic has been mixed, a recent randomized, double-blind, placebo-controlled study of 25 men with CUD found that baclofen relative to placebo reduced neural activation in response to cocaine cues. Given that there were no between-group differences in neural response to sexual or aversive cues, a specificity of baclofen’s effect on drug cues was suggested [80].
Gabapentin
In 2019, a systematic review by Ahmed et al. concluded that the available evidence did not show that gabapentin produced any significant benefits with respect to cocaine craving, abstinence, treatment retention, or future use [81••]. Nonetheless, the review did not assess the question of relapse prevention.
Bupropion
Bupropion, a blocker of dopamine and norepinephrine reuptake, has shown abuse liability and mixed results in the treatment of CUD. With a chemical structure similar to amphetamines and cathinone, bupropion has demonstrated varying degrees of benefit, with one study showing no difference from placebo [82], and another finding potential benefit, but only in methadone-maintained men, and only in comparison to combined placebo and contingency management [83].
Modafinil
Modafinil is a blocker of dopamine re-uptake and an agonist at type II metabotropic glutamate receptors (mGluR2/3) that regulate extracellular glutamate levels and glutamate release in response to external stimuli. Modafinil induces a lower response on the amphetamine scale of the addiction research center inventory, and though it has abuse potential, it is lower than that of amphetamine [84].
Modafinil may normalize slow wave sleep in CUD and is associated with improved clinical outcomes, including cocaine-free urine toxicology [84]. Despite promise in human laboratory studies showing modafinil reducing cocaine self-administration and subjective positive effects of cocaine [85, 86], other findings are mixed. Secondary analyses of negative trials originally suggested that modafinil may be effective in subgroups of CUD such as that without co-occurring AUD [87] and in preventing relapse rather than maintaining abstinence [88]. Subsequent efforts at replicating these findings have been less successful [89,90,91].
Stimulants
Non-cocaine stimulants have been tested as potential treatments for CUD. Research testing lisdexamphetamine dimesylate for the treatment of CUD suggested reductions in craving but not in cocaine use, compared to placebo [92].
Studies of amphetamine in CUD patients include CUD with and without co-occurring opioid use disorder (OUD) [93, 94••] and co-occurring attention-deficit/hyperactivity disorder (ADHD). This latter comorbidity is important as ADHD is overrepresented among CUD, and co-occurring ADHD and CUD is associated with poor long-term treatment outcomes [95].
Studies on stimulant efficacy for co-occurring CUD/ADHD have been inconclusive. In one study examining treatment efficacy of sustained-release methylphenidate, no significant benefits were found for ADHD, nor for primary outcomes of CUD; however, participants who showed improvement of ADHD symptoms with methylphenidate were additionally found to have fewer positive urine drug screens compared to non-responders [96]. A separate study tested higher doses of sustained-released amphetamine at 60 or 80 mg/day, in addition to CBT, and found improved treatment outcomes for both ADHD and CUD [97]. Higher doses of amphetamines appeared to offer more benefit for CUD while the lower dose was more beneficial for ADHD. A secondary analysis found that a particular subgroup of participants had longer periods of cocaine abstinence without improvement in ADHD symptoms, while in another subgroup, improvement in ADHD symptoms preceded and appeared to influence benefit in CUD symptoms [97].
Among individuals with co-occurring CUD and OUD who were undergoing heroin-assisted treatment, sustained-release dextroamphetamine was well tolerated and was associated with low attrition [93]. However, a recent systematic review by Chan et al. found that while cocaine-free urinalyses occurred more frequently with psychostimulants than placebo, the difference was not statistically significant [94••].
Ketamine
Preliminary clinical studies suggest efficacy of ketamine for treating CUD. A single, IV injection of ketamine (vs. lorazepam) increased motivation to quit and decreased cue-induced cravings [98]. A recent prospective, randomized, active placebo (midazolam) controlled trial found that a single IV injection of 0.5 mg/kg ketamine and mindfulness-based behavioral modification (MBBM) produced statistically significant and clinically superior outcomes, including prolonged times to relapse and fourfold higher end-of-trial abstinence rates, compared to midazolam [32, 99]. Additionally, subjective experience of mysticism during IV ketamine infusion was found to mediate effects of ketamine on decreased cocaine use and craving [100]. Notwithstanding promising preliminary clinical work in support for ketamine, its psychotomimetic effects and potential for abuse are important considerations.
Clinical Implementation
Further study of baclofen is warranted based on early results. While preclinical work has provided weak evidence of benefit and meta-analyses are not supporting clinical benefits [101], recent studies suggest potential benefits for cue exposure. Clinicians should be aware of baclofen’s abuse potential.
While the use of gabapentin for CUD lacks compelling support, the combination of (1) subjective benefit, (2) good tolerance, and (3) low adverse-effect profile leaves open the possibility of using gabapentin in CUD. Additionally, gabapentin helps to restore sleep architecture in CUD [90], albeit with a risk of habit formation.
Studies of bupropion and modafinil have found that both decreased the amount of urine-positive drug screens, but neither has been found to have substantial benefit in decreasing craving, relapse, or the subjective effects of cocaine in clinical trials. Stimulants, however, do appear to lower cravings and increase length of abstinence. There may be a particular clinical application of these medications in the use of treating CUD with co-occurring ADHD, but additional studies are needed to further confirm the exact benefit of these medications in individuals with dual diagnoses. Additionally, the potential for abuse of stimulant medications — especially in individuals with CUD — warrants caution when prescribing these medications.
Ketamine and psychedelic drugs may offer promise for treating CUD based on preclinical and observational studies. However, larger clinical trials appear needed before they may be recommended for use in non-research settings.
Opioid Use Disorder (OUD)
Ketamine
Given ketamine’s neuroplastic effects, it may augment psychotherapeutic interventions. One open-label study investigated dose-dependent effects of intramuscular ketamine, combined with psychotherapy, among persons with OUD [102]. Both the dissociative (2.0 mg/kg) and the non-dissociative (0.2 mg/kg) doses of ketamine reduced opioid craving, promoted longer abstinence, and were associated with positive changes in emotional attitudes [102]. In a follow-up study, repeated treatment sessions were associated with more frequent abstinence a year following treatment [103]. Additionally, administration of a single dose (IV or intranasal) of ketamine following surgical procedures may reduce opioid consumption for pain during recovery [104,105,106,107].
Psychedelics
Observational evidence suggests an association between psychedelic use and less opioid use. In 44,000 individuals using illicit opioids, those who used psychedelics had a 27% reduced odds of past-year opioid dependence and a 40% reduced odds of past-year opioid abuse when controlling for demographic variables and other drug use [108]. Online surveys of naturalistic use of psychedelics in non-clinical settings suggest less opioid use [109]. Additionally, psychedelic use has been associated with lower suicidal ideation and fewer suicide attempts among marginalized women who were prescribed opioids [110].
In particular, the psychedelic ibogaine has shown promise as a potential treatment for OUD [111]. Among 30 individuals with OUD, following administration of ibogaine, 50% of individuals remained abstinent from opioids at one month, and 23% of individuals continued to remain abstinent at 12 months [112]. Additional randomized, placebo-controlled clinical trials with control groups are needed to assess the efficacy of ibogaine.
Clinical Implementation
Ketamine appears to offer potential benefit in managing pain and opioid withdrawal, processes that may drive further opioid use. However, further work is needed to establish the efficacy of ketamine treatment for OUD, especially in light of ketamine’s abuse potential. Preliminary evidence indicates that psychedelics, and notably ibogaine, may offer potential in the treatment of OUD, and further randomized double-blind placebo-controlled trials are needed to formally assess efficacy and tolerability.
Conclusions
Pharmacological agents with potential abuse liability offer promise for treating SUDs. This narrative review assesses recent studies on such agents. While some agents such as gabapentin, baclofen, and modafinil are already available for use by clinicians, other treatments such as ketamine and cannabinoids are limited in their approved uses, and GHB and psychedelics have no FDA approval. Regardless of their current FDA approval statuses and potentials for abuse, these agents should not be dismissed with respect to potential treatment of SUDs.
Gabapentin, for example, may improve sleep and decrease negative subjective effects of withdrawal in AUD and CbUD with little additional risk to patients. Its ability to reduce discomfort associated with withdrawal makes gabapentin a worthwhile consideration for treating individuals who have recently stopped using alcohol and cannabis. Nabiximols appear to decrease use and withdrawal symptoms in CbUD, although it is less clear that they may promote abstinence. At the very least, off-label use may be considered for individuals with severe, treatment-refractory CbUD. Stimulant medications may reduce cravings and increase abstinence in CUD, especially in individuals with co-occurring ADHD. Although it may initially seem counterintuitive to treat CUD with a stimulant, this substitution approach is gaining neurobiological support based on chronic hypodopaminergic states after chronic cocaine use. Concerns about diversion could be mitigated in similar ways as with other substitution approaches (i.e., frequent monitoring of urine toxicology, using prescription monitoring databases, etc.).
Ketamine and psychedelics may offer benefits in treating multiple SUDs. Ketamine may reduce withdrawal symptoms, promote abstinence, and reduce cravings in AUD and CUD (especially when paired with therapy), and also reduce pain, discomfort, and cravings associated with OUD withdrawal. Psychedelics appear to promote durable remission, decrease use, and reduce cravings in AUD and OUD. However, these agents are limited by the lack of clinical trials in SUD populations. Although ketamine is now FDA-approved for treatment-resistant depression, and psilocybin and MDMA are being studied for treatment of PTSD and major depression, more studies of clinical outcomes are needed to investigate potential risks and benefits for use in SUDs.
Although the agents reviewed here all have therapeutic potential, there is still much knowledge to gain and further clinical research to be completed before effective implementation in practice. For instance, studies exploring and/or showing alterations in synaptic density across several SUDs motivates exploration of psychedelics and ketamine’s synaptotropic properties as potential mechanism of action [113, 114]. We do not yet have comparisons of efficacies between potential treatments, nor do we know how their potential for abuse may impact therapeutic benefits in individuals with SUDs. Additionally, as these pharmacologic agents are employed by clinicians, it should be established whether they constitute 1st, 2nd, or 3rd line treatments. Clinical trials with greater power in diverse groups of participants that compare multiple treatment arms are needed to investigate further the therapeutic effects of drugs with abuse potential.
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Acknowledgements
The work described in this article (or chapter or book) was funded in part by the State of Connecticut, Department of Mental Health and Addiction Services, but this publication does not express the views of the Department of Mental Health and Addiction Services or the State of Connecticut. The views and opinions expressed are those of the authors.
Funding
This work was funded by the National Institute of Mental Health (NIMH) award R25MH071584-14 (BM), The National Institute on Drug Abuse (NIDA) awards R01 DA052454-01A1 (GAA, MNP), R21 1DA046030-02 (GAA), R21 DA043055 (GAA, MNP), and K23DA052682 (JPD). The content is solely the responsibility of the authors and does not necessarily represent the official views of the NIMH or NIDA.
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The authors declare no conflicts of interest. Dr. Potenza has consulted for Opiant Therapeutics, Game Day Data, Baria-Tek, the Addiction Policy Forum, AXA and Idorsia Pharmaceuticals; has been involved in a patent application with Yale University and Novartis; has received research support from Mohegan Sun Casino and the National Center for Responsible Gaming; has participated in surveys, mailings or telephone consultations related to drug addiction, impulse-control disorders or other health topics; has consulted for and/or advised gambling and legal entities on issues related to impulse-control/addictive disorders; has provided clinical care in a problem gambling services program; has performed grant reviews for research-funding agencies; has edited journals and journal sections; has given academic lectures in grand rounds, CME events and other clinical or scientific venues; and has generated books or book chapters for publishers of mental health texts. The other authors do not report disclosures.
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Martins, B., Rutland, W., De Aquino, J.P. et al. Helpful or Harmful? The Therapeutic Potential of Medications with Varying Degrees of Abuse Liability in the Treatment of Substance Use Disorders. Curr Addict Rep 9, 647–659 (2022). https://doi.org/10.1007/s40429-022-00432-9
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DOI: https://doi.org/10.1007/s40429-022-00432-9