- 1Department of Psychiatry, The School of Clinical Medicine, Hunan University of Chinese Medicine, Changsha, Hunan, China
- 2Department of Psychiatry, The Second People's Hospital of Hunan Province (Brain Hospital of Hunan Province), Changsha, Hunan, China
- 3Department of Thoracic Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
Objective: Disulfiram, an FDA-approved medication for AUD, has shown significant potential as a repurposed drug in therapeutic areas including oncology and infectious diseases. The purpose of study is to analyze adverse events (AEs) associated with disulfiram by examining the FAERS database, with a focus on understanding its safety profile in both traditional and emerging applications.
Methods: AE reports concerning disulfiram in the FAERS database from the fourth quarter of 2002 to the third quarter of 2023 were extracted. Various signal detection methods, including ROR, PRR, BCPNN, and MGPS, were used to detect and categorize adverse events.
Results: The study collected 52,159,321 AE reports, with 508 reports primarily suspecting disulfiram, identifying 104 Preferred Terms (PTs) across 25 System Organ Classes (SOCs). Major categories of AEs included off label use, psychiatric symptom, liver transplant, and polyneuropathy, with off label use being notably the most reported issue. Strong and new potential AEs were identified, including neurological and psychiatric issues like hypomania, delirium, and vocal cord paralysis; cardiac issues such as electrocardiogram st segment depression; and off label use-related issues like Jarisch-Herxheimer reaction.
Conclusion: Disulfiram poses risks of various adverse reactions while having promise as a “repurposed” agent. In clinical applications, practitioners should closely monitor occurrences of hepatobiliary disorders, psychiatric disorders, and nervous system disorders.
1 Introduction
Disulfiram is an electrophilic quaternary ammonium compound whose metabolite diethyldithiocarbamate (DDTC) binds to metal ions (e.g., copper) and forms a precipitate. DDTC can hinder the activity of different metabolic enzymes in the body, such as aldehyde dehydrogenase (ALDH), by attaching to important cofactors (1). When alcohol is consumed, the suppression of ALDH causes acetaldehyde to accumulate, resulting in unpleasant symptoms like nausea, vomiting, and headaches (2). A significant degree of pain may be caused by even a small amount of alcohol, which is one of the reasons why individuals quit drinking alcohol. As a pharmacological therapy for alcohol use disorder (AUD), disulfiram was approved by the Food and Drug Administration (FDA) of the United States of America in the year 1951. As a result of the detrimental effects of disulfiram, which include hepatotoxicity and neurotoxicity, its application in clinical settings has been reduced. Due to the fact that these toxicities have the potential to result in significant health consequences, the employment of this drug in alcohol cessation therapy is rather uncommon. Since pharmaceutical treatments for AUD, such as naltrexone and acamprosate, have received approval from the FDA, there has been a decrease in the utilization of disulfiram (3).
Due to the growing interest in pharmacological repurposing, researchers have re-evaluated the therapeutic potential of disulfiram. Disulfiram possesses sulfhydryl-modifying and chelating properties that causes a diverse range of pharmacological effects, such as anticancer, antiparasitic, and anti-inflammatory applications (4–6). Multiple clinical trials have been registered for new indications, presenting possibilities for disulfiram’s use in new therapeutic areas (7, 8). For instance, a phase I/II clinical trial was conducted to evaluate the safety and preliminary efficacy of disulfiram combined with copper in patients with newly diagnosed glioblastoma. The findings indicated that promising responses were observed in patients with BRAF-mutant GBM (9). Another study demonstrated that disulfiram combined with copper ions forms the Cu(DDC)2 complex. Cu(DDC)2 induces apoptosis in tumor cells and promotes the production of reactive oxygen species (ROS), showing antitumor effects even in drug-resistant cancer cells (10). Nevertheless, repurposing disulfiram proves challenging due to the drug’s plethora of undesirable side effects. The combination of alcohol with various everyday household products, such as cough syrups and hand sanitizers containing alcohol, can result in a disulfiram-alcohol-like reaction. As a result, employing it in the clinic is more complicated. Before considering its application to new indications, a comprehensive risk assessment is essential (11).
Recently, a pharmacovigilance study analyzed adverse drug reaction data from the International Psychiatric Medication Safety Program (AMSP). According to Greil et al., an increased risk of cutaneous adverse drug reactions (CADR) is associated with disulfiram (12). But additional systemic side effects of disulfiram were not included in this research. This calls for more investigation. The FDA Adverse Event Reporting System (FAERS) is a database that collects information on adverse events (AEs) and medication errors associated with drugs and biologic products. It helps the FDA monitor and review the safety of these products and identify potential safety issues. This study was based on the FAERS database and used multiple signaling methods to detect the AEs signals of disulfiram. The primary objective of this research is to shed light on its safety profile in both traditional and emerging applications.
2 Materials and methods
2.1 Data sources and processing
In the FAERS database, reporters can explicitly indicate the role of a drug in the occurrence of an adverse event, such as “Primary Suspect” (PS), “Secondary Suspect” (SS), “Interaction,” or “Concomitant” (C). This study gathered all AE reports from the fourth quarter of 2002 to the third quarter of 2023 in which disulfiram was the primary suspected drug. All data were sourced from the FAERS database. The study collected clinical features of patients who experienced AEs related to disulfiram, including gender, age, reporter type, country of report, year of report, adverse events and their outcomes. To eliminate duplicate reports, we performed data cleaning following the FDA’s recommended approach. Firstly, the Demo table was sorted by CASEID, FDA_DT, and PRIMARYID. For records with the same CASEID, we retained the most recent report based on the update date. Secondly, when FDA_DT and CASEID were identical, we selected the report with the largest PRIMARYID value. The analysis utilized the Medical Dictionary for Regulatory Activities (MedDRA) for coding, categorizing, and localizing AEs signals according to Preferred Terms (PTs) and System Organ Classes (SOCs) categories (13). PTs with reported counts of ≥3 were included.
2.2 Statistical analysis
All AE reports associated with disulfiram were analyzed using descriptive statistics. Multiple disproportionality methods were utilized to detect drug-AE signals, including Reporting Odds Ratio (ROR), Proportional Reporting Ratio (PRR), Bayesian Confidence Propagation Neural Network (BCPNN), and Multi-Item Gamma Poisson Shrinker (MGPS) (14–17). ROR and PRR highlighted risks associated with specific drugs by identifying abnormally high proportions of AE reports. ROR corrected biases from small sample sizes, while PRR provided greater specificity in distinguishing drug-related AEs. BCPNN integrated multi-source data and cross-validation, offering more credible drug-AE associations. MGPS accounted for report quantity and background risk, detecting rare event signals. By combining these methods, the study expanded detection scope, verified results, and leveraged each method’s strengths to identify more complete and trustworthy safety signals. The combined use of these algorithms enables cross-validation to reduce erroneous signals or irrelevant reports. Moreover, by adjusting thresholds and variance within the algorithms, rare but significant adverse event signals can be more effectively identified. This approach enhances the sensitivity and accuracy in detecting these rare events. Detailed calculation formulas and specific procedures are presented in Tables 1, 2. We used Microsoft Excel 2021 and R software 4.3.1 to conduct our statistical analyses.
3 Results
3.1 Basic characteristic of AE reports
This study collected a total of 52,159,321 AE reports from the fourth quarter of 2002 to the third quarter of 2023 in the FAERS database. There were 508 reports primarily suspecting disulfiram among these. Based on the gender of reports, male reporters (298, accounting for 58.7%) significantly outnumbered female reporters (173, accounting for 34.1%). Age-wise, the majority of reporters belonged to the 18-64 age range, accounting for 72.6%. The main sources of these reports were Physician, who made up 27%. Additionally, patients themselves and health professionals each contributed approximately 20% of the reports. Regarding the reporting countries, the foremost countries contributing to AE records of disulfiram were the United States, followed by Sweden, India and the United Kingdom, accounting for 226, 40, 34, and 34 records, respectively. From 2014 to 2020, the number of disulfiram adverse event reports generally declined, while in 2021, there was a significant increase. From the perspective of adverse outcomes, hospitalization or prolongation of hospitalization accounted for 36.5% of all reports. Furthermore, other serious accounted for 38.6%. This information is summarized in Table 3.
3.2 Disulfiram signal mining
This study identified the intensity of signals and the quantity of reports for disulfiram at the SOC level. Statistically, we identified that disulfiram-induced AEs were associated with 25 SOCs. The SOCs with the highest report frequencies, as shown in Table 4, were nervous system disorders(n = 395, ROR 2.64, PRR 2.32, IC 1.21, EBGM 323.48), psychiatric disorders(n = 273, ROR 2.62, PRR 2.40, IC 1.26, EBGM 236.23), general disorders and administration site conditions(n = 268, ROR 0.74, PRR 0.77, IC -0.38, EBGM 22.13), injury, poisoning and procedural complications(n = 176, ROR 0.86, PRR 0.87, IC -0.20, EBGM 3.65) and investigations(n = 168, ROR 1.39, PRR 1.36, IC 0.44, EBGM 16.92), which are consistent with the information recorded in disulfiram’s prescribing information. Notably, the SOC with significant association to disulfiram AEs by meeting all four criteria simultaneously was hepatobiliary disorders (n = 141, ROR 8.26, PRR 7.75, IC 2.95, EBGM 836.51). Besides, this study also revealed unexpected AEs related to gastrointestinal disorders(n = 109, ROR 0.62, PRR 0.64, IC -0.64, EBGM 23.92), metabolism and nutrition disorders(n = 61, ROR 1.42, PRR 1.41, IC 0.49, EBGM 7.33), and vascular and lymphatic vessel diseases(n = 58, ROR 1.36, PRR 1.35, IC 0.43, EBGM 5.39), which were not included in the drug leaflet.
In the comprehensive detection of disulfiram-induced adverse events at the PT level using four different algorithms, a total of 104 AEs were identified. Based on the value of EBGM05 (the most stringent algorithm), the top 50 PTs were listed in Table 5 (17). In our study, some PTs were consistent with warnings in instructions and drug labeling, such as psychiatric symptom (n = 42, ROR 175.24, PRR 171.57, IC 7.41, EBGM 7076.63), liver transplant (n = 12, ROR 103.55, PRR 102.93, IC 6.68, EBGM 1206.59), acute hepatic failure (n = 17, ROR 40.82, PRR 40.48, IC 5.34, EBGM 653.73), polyneuropathy (n = 13, ROR 35.43, PRR 35.21, IC 5.14, EBGM 431.58), hepatitis acute (n = 8, ROR 38.25, PRR 38.10, IC 5.25, EBGM 288.60) and generalized tonic-clonic seizure (n = 17, ROR 20.12, PRR 19.96, IC 4.32, EBGM 306.02). Notably, off label use (n = 80, ROR 3.31, PRR 3.22, IC 1.69, EBGM 123.94) ranked first occurrence. In addition, a number of AEs were observed that showed significant signal strength, although at low frequencies, including electrocardiogram st segment depression (n = 4, ROR 52.36, PRR 52.26, IC 5.70, EBGM 200.73), delirium (n = 15, ROR 13.90, PRR 13.80, IC 3.79, EBGM 178.07), vocal cord paralysis (n = 3, ROR 50.87, PRR 50.80, IC 5.66, EBGM 146.17), hypomania (n = 4, ROR 32.63, PRR 32.57, IC 5.02, EBGM 122.25), Jarisch-herxheimer reaction (n = 3, ROR 131.57, PRR 131.38, IC 7.03, EBGM 386.22) and so on. These AEs were not documented in the prescribing information and might represent new potential AE signals.
4 Discussion
Disulfiram, the first FDA-approved drug to treat AUD, has been used since 1951. Due to the disulfiram-ethanol reaction, alcohol and a variety of household products must be avoided during disulfiram treatment. Additionally, disulfiram can cause multiple side effects and affect the metabolism of other drugs by inhibiting cytochrome P450 reductase. Disulfiram’s table information lists common side effects such as headaches, drowsiness, fatigue, and a metallic or garlic-like taste (18). Both the insert and randomized controlled trials report more severe reactions like optic neuritis, peripheral neuropathy, and hepatotoxicity, which are more frequent at higher doses or when combined with other medications (19, 20). These factors contribute to poor patient compliance, leading to a gradual decline in the use of disulfiram. However, in recent years, disulfiram has shown new progress in novel therapeutic areas such as antitumor therapy (10). This study identified a series of disulfiram-related AEs signals and systematically evaluated its real-world safety, providing a reference for its application in new indications.
4.1 Basic analysis of AE occurrences
This study examined disulfiram AE reports from the FAERS database over the last two decades. The higher proportion of male reporters could be linked to a higher prevalence of AUD among men. According to research, the frequency of AUD among males is about 4-5 times higher than in females (21). From the perspective of reported age, it partly reflects that the primary population for AUD consists of adults (21), and partly relates to the broad age range covered, suggesting that further stratification by age may be required in future analyses. The gradual decline in AE reports over the past five years might be influenced by the reduced use of disulfiram in the treatment of AUD (3). Physicians constitute the largest reporting group, possibly indicating close attention from healthcare professionals to drug reactions. Given that most reports come from the U.S. (44.5%), this is likely related to the country’s relatively high prevalence of AUD. According to the 2023 National Survey on Drug Use and Health (NSDUH), approximately 10.2% of the U.S. population had AUD, ranking the country 5th among those with the highest AUD prevalence (22, 23). Over the past decade, the number of disulfiram adverse event reports has fluctuated, influenced by the decline in its use for traditional indications and the exploration of new indications, particularly with a notable increase in 2021 due to trials in anti-tumor therapy (9). The high incidence of hospitalization or prolonged hospital stays may imply negative impacts of disulfiram on patient outcomes, underscoring the need for heightened vigilance in monitoring adverse reactions during clinical use.
4.2 Known AEs
4.2.1 Hepatobiliary AEs
Due to the biological and histological changes in the liver caused by unhealthy alcohol use in most patients who used disulfiram, the true incidence of disulfiram-induced hepatotoxicity was unclear. Based on data from the Swedish DILI (Drug-Induced Liver Injury) registry, Björnsson et al. identified 82 reports of disulfiram-induced liver injury over 36 years. Specifically, approximately 1 case of liver injury was reported per 1.3 million average daily doses of disulfiram (24). The risk of severe hepatitis leading to death or requiring liver transplantation was even lower. According to Chick’s estimates, only 1 fatal case occurs annually per 30,000 patients treated with disulfiram (25). The mechanism of disulfiram-induced liver injury was not fully understood, but it was primarily associated with its metabolites inhibiting the P4502E1 enzyme and the production of autoantibodies against cytochrome P450 enzymes. The autoimmune response resulted in a hypersensitivity reaction characterized by eosinophilic infiltration in the liver. Additionally, a few liver biopsy specimens showed hepatocellular drop-out necrosis, which was associated with worse outcomes such as liver transplantation or fulminant liver failure. A study on biomarkers for drug-induced liver injury indicated that bilirubin levels could predict death or liver transplantation (26). This study suggested that clinicians should regularly monitor liver function when administering disulfiram.
4.2.2 Neuropathy AEs
Due to the potential risk of unexpected disulfiram-alcohol reaction, disulfiram drug labeling recommendations require extra caution when prescribing disulfiram for patients with conditions such as epilepsy. In reality, disulfiram could cause seizures even without alcohol consumption. Disulfiram inhibits dopamine-β-hydroxylase, an enzyme that converts dopamine to norepinephrine. The inhibition results in an imbalance of neurotransmitters, namely an increase in dopamine levels and a decrease in norepinephrine levels in the brain. This imbalance directly affects the threshold for seizures (27, 28). In addition, studies have demonstrated that carbon disulfide (CS2), which is another byproduct of disulfiram metabolism, can cause seizures in both animals and people (29). Disulfiram may have reduced the seizure threshold, resulting in more frequent and severe seizures, particularly generalized tonic-clonic seizures (30). The prescribing instructions of disulfiram also documented peripheral neuropathy as an adverse effect, so indirectly corroborating the credibility of this study.
4.3 Potential mechanisms of new potential AEs
4.3.1 Neurological and Psychiatric AEs
Hypomania was related to the increase in dopamine concentration in the brain caused by disulfiram (31). The heightened activity of dopamine within the mesolimbic system, particularly in the nucleus accumbens and ventral tegmental area, could potentially explain the emergence of hypomanic moods. Delirium was one of the clinical manifestations of disulfiram encephalopathy, although the exact mechanism remained unclear. The toxic metabolite of disulfiram, diethyldithiocarbamate, precipitated upon binding with copper. The excess dopamine, copper deposition in the basal ganglia, and CS2 accumulation might have contributed to encephalopathy development. Vocal cord paralysis was also identified as a neurological complication induced by disulfiram. The potential mechanisms for this condition include the following: On one hand, CS2, a known axonal toxin, could cause neuropathological changes (29). On the other hand, disulfiram might directly affect Schwann cells, disrupting the formation of the myelin sheath around nerve fibers (32, 33). Although neurological adverse effects were rare, they had the potential to cause severe consequences once they occurred. In clinical practice, the identification and management of these neurological adverse effects required a clear understanding of the clinical manifestations and timely implementation of appropriate interventions.
4.3.2 Cardiac system AEs
Electrocardiogram st segment depression was associated with the disulfiram-alcohol reaction. The disulfiram-alcohol reaction referred to a series of adverse symptoms resulting from the accumulation of acetaldehyde in the body due to disulfiram’s inhibition of ALDH activity. Typical symptoms included flushing, headache, nausea, vomiting, sweating, dizziness, and vertigo. More severe cases might present with profound hypotension, arrhythmias, myocardial infarction, and cardiovascular collapse (34). Currently, disulfiram was forbidden in patients with severe myocardial disease or coronary occlusion. It emphasized the importance of ensuring that patients avoid ethanol and other interacting substances while on disulfiram treatment.
4.3.3 Off label use-related AEs
Disulfiram was originally indicated for the treatment of AUD to aid in abstinence. Recently, growing evidence has demonstrated the potential of repurposing disulfiram for the treatment of various pathologies such as inflammation, Lyme disease, and cancer (4, 10, 35). Numerous mechanistic studies have shown that disulfiram possesses remarkable anticancer properties, such as triggering oxidative stress (36), inhibiting proteasome activity (37), reducing angiogenesis (38), blocking the cell cycle (36), decreasing cancer stemness (39), reversing drug resistance (40), limiting tumor metastasis (41), and modulating the immune microenvironment (42). Reports of off label use of disulfiram have been substantial. However, the drug’s clinical utility has been hampered by its extensive adverse effects. A case involving off-label disulfiram use for melanoma described the onset of posterior reversible encephalopathy syndrome (PERS), a rare but severe side effect, after two weeks of treatment (43). The Jarisch-Herxheimer reaction has also been associated with off-label use of disulfiram in treating Lyme disease (4). This finding highlights the significant risks associated with off-label use, which currently lacks sufficient clinical research support.
4.4 Limitations
This study conducted a detailed analysis of the FAERS database to explore AEs closely associated with disulfiram use. However, the study’s limitations must be acknowledged. The FAERS database observational reports, upon which this investigation was based, do not prove a direct correlation between the medicine and the side effects. To identify the exact processes causing these events, more clinical trials and preclinical investigations are required. It is possible that preexisting diseases, rather than the medicine itself, were to blame for the reported side effects. Few reports of AEs were included in the study because it relied on participants’ own words to fill out the questionnaires. Compared to randomized controlled trials, the FAERS data has inherent limitations such as reporting bias and underreporting. However, it provides valuable real-world insights into adverse events that may not be fully captured in the controlled environments of controlled trials. In addition, the drug’s characteristics, individual patient characteristics, and other medical issues can all impact the signal for disulfiram-related adverse reactions. These confounding factors have the potential to affect the reliability of the study’s results. A thorough assessment of disulfiram’s safety should be conducted in future studies by combining extensive clinical evaluations with long-term data.
5 Conclusion
This research discovered some anticipated and unforeseen adverse effects of disulfiram through their examination of the FAERS database. The reported AEs, including neurotoxicity and hepatotoxicity, are consistent with the information recorded in the disulfiram prescribing information, validating the reliability of this study. The frequent utilization of disulfiram for off-label purposes highlights the drug’s capacity for repurposing. Delirium, vocal cord paralysis, and electrocardiogram st segment depression were among the many possible AEs found during the investigation that were not mentioned on the drug’s label. Although there are some limitations to the data, these preliminary findings will certainly be valuable for monitoring the safety of disulfiram in clinical practice. The study also points the way towards potential areas of investigation for the future. Exploring the particular mechanisms and management techniques for disulfiram-related AEs is vital for developing disulfiram’s new clinical applications.
Data availability statement
The original contributions presented in the study are included in the article/supplementary material. Further inquiries can be directed to the corresponding author.
Author contributions
JL: Conceptualization, Formal analysis, Methodology, Visualization, Writing – original draft, Writing – review & editing. YZ: Data curation, Methodology, Software, Writing – original draft, Writing – review & editing. ZC: Data curation, Resources, Software, Writing – review & editing. YL: Investigation, Writing – review & editing. LS: Writing – review & editing. XZ: Conceptualization, Funding acquisition, Supervision, Writing – review & editing.
Funding
The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was financially supported by the Clinical Research Center For Addiction Disorder in Hunan Province (No.2023SK4055), the Scientific Research Project of the Hunan Health Commission (No.A202303096949), the Foundation of Hunan Provincial Administration of Traditional Chinese Medicine (No.B2024102), Hunan Provincial Health High-Level Talent Scientific Research Project (No.R2023178), National Cultivation Project of Key Clinical Specialty (Addiction medicine), Hunan Province clinical key specialty (Addiction medicine), Key Clinical Specialty Construction Project of the Hunan Health Commission (Improvement of Diagnosis and Treatment Ability of Severe Psychiatric Diseases in Hunan Province).
Acknowledgments
This study was performed using the FAERS source that was provided by the FDA.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Author disclaimer
The information, results, or interpretation of the current study do not represent any opinion of the FDA.
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Keywords: disulfiram, FAERS, real-world data analysis, signal mining, adverse event
Citation: Luo J, Zeng Y, Chen Z, Luo Y, Shi L and Zhou X (2024) Safety assessment of disulfiram: real-world adverse event analysis based on FAERS database. Front. Psychiatry 15:1498204. doi: 10.3389/fpsyt.2024.1498204
Received: 18 September 2024; Accepted: 30 October 2024;
Published: 19 November 2024.
Edited by:
Jaya Kumar, National University of Malaysia, MalaysiaReviewed by:
Susie H. Park, Riverside University Health System, United StatesJustin Faden, Temple University, United States
Copyright © 2024 Luo, Zeng, Chen, Luo, Shi and Zhou. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Xuhui Zhou, 330115@hnucm.edu.cn
†These authors have contributed equally to this work