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Stimulation of the Ca(2+)-ATPase of sarcoplasmic reticulum by disulfiram.

Disulfiram [bis(diethylthiocarbamoyl)disulphide] has been found to stimulate reversibly the Ca(2+)-ATPase of skeletal muscle sarcoplasmic reticulum. At pH 7.2, 2.1 mM ATP and 25 degrees C, ATPase activity was found to double on addition of 120 microM disulfiram. Stimulation fitted to binding of disulfiram at a single site with a Kd of 61 microM. Disulfiram had no effect on the Ca2+ affinity of the ATPase or on the rate of phosphorylation of the ATPase by ATP, but increased the rate of dissociation of Ca2+ from the phosphorylated ATPase (the transport step) and increased the rate of dephosphorylation of the phosphorylated ATPase. It also decreased the level of phosphorylation of the ATPase by Pi, consistent with a 7.5-fold decrease in the equilibrium constant of the phosphorylated to non-phosphorylated forms (E2PMg/E2PiMg) at 80 microM disulfiram. Disulfiram had no significant effect on the concentration of ATP resulting in stimulation of ATPase activity, suggesting that it does not bind to the empty nucleotide-binding site on the phosphorylated ATPase. Studies of the effects of mixtures of disulfiram and jasmone (another molecule that stimulates the ATPase) suggest that they bind to separate sites on the ATPase.

Alcohol Deterrents↗

Treatment of cocaine and alcohol dependence with psychotherapy and disulfiram.

AIMS: To evaluate disulfiram and three forms of manual guided psychotherapy for individuals with cocaine dependence and concurrent alcohol abuse or dependence. DESIGN: Randomized controlled trial. SETTING: Urban substance abuse treatment center. PARTICIPANTS: One hundred and twenty-two cocaine/alcohol abusers (27% female; 61% African-American or Hispanic). INTERVENTIONS: One of five treatments delivered over 12 weeks: cognitive behavioral treatment (CBT) plus disulfiram; Twelve Step facilitation (TSF) plus disulfiram; clinical management (CM) plus disulfiram; CBT plus no medication; TSF plus no medication. MEASUREMENTS: Duration of continuous abstinence from cocaine or alcohol; frequency and quantity of cocaine and alcohol use by week, verified by urine toxicology and breathalyzer screens. FINDINGS: Disulfiram treatment was associated with significantly better retention in treatment, as well as longer duration of abstinence from alcohol and cocaine use. The two active psychotherapies (CBT and TSF) were associated with reduced cocaine use over time compared with supportive psychotherapy (CM). Cocaine and alcohol use were strongly related throughout treatment, particularly for subjects treated with disulfiram. CONCLUSIONS: For the large proportion of cocaine-dependent individuals who also abuse alcohol, disulfiram combined with outpatient psychotherapy may be a promising treatment strategy. This study underlines (a) the significance of alcohol use among treatment-seeking cocaine abusers, (b) the promise of the strategy of treating co-morbid disorders among drug-dependent individuals, and (c) the importance of combining psychotherapy and pharmacotherapy in the treatment of drug use disorders.

Adult↗

Disulfiram treatment for cocaine dependence in methadone-maintained opioid addicts.

AIMS: Cocaine use by patients on methadone maintenance treatment is a widespread problem and is associated with a poorer prognosis. Recent studies have evaluated disulfiram as a treatment for individuals with comorbid alcohol and cocaine abuse. We evaluated the efficacy of disulfiram for cocaine dependence, both with and without co-morbid alcohol abuse, in a group of methadone-maintained opioid addicts. DESIGN: Randomized double-blind, placebo-controlled trial. SETTING: Urban methadone maintenance clinic. PARTICIPANTS: Sixty-seven cocaine-dependent, methadone-maintained, opioid-dependent subjects (52% female; 51% Caucasian). INTERVENTION: Study medication, either disulfiram or placebo, was placed directly in the methadone to ensure compliance for 12 weeks. MEASUREMENTS: Primary outcome measures included weekly assessments of the frequency and quantity of drug and alcohol use, weekly urine toxicology screens and breathalyzer readings. FINDINGS: Disulfiram treated subjects decreased the quantity and frequency of cocaine use significantly more than those treated with placebo. Alcohol use was minimal for all subjects regardless of the medication. CONCLUSIONS: Disulfiram may be an effective pharmacotherapy for cocaine abuse among methadone-maintained opioid addicts, even in those individuals without co-morbid alcohol abuse. Disulfiram inhibits dopamine beta-hydroxylase resulting in an excess of dopamine and decreased synthesis of norepinephrine. Since cocaine is a potent catecholamine re-uptake inhibitor, disulfiram may blunt cocaine craving or alter the "high", resulting in a decreased desire to use cocaine.

Cocaine-Related Disorders↗

One-year follow-up of disulfiram and psychotherapy for cocaine-alcohol users: sustained effects of treatment.

AIM: To evaluate outcomes 1 year after cessation of treatment for cocaine- and alcohol-dependent individuals. DESIGN: Randomized controlled trial. SETTING: Urban substance abuse treatment center. PARTICIPANTS: Ninety-six of 122 subjects randomized to treatment. INTERVENTIONS: One of five treatments delivered over 12 weeks. Cognitive-behavioral treatment (CBT) plus disulfiram; Twelve-Step facilitation (TSF) plus disulfiram; clinical management (CM) plus disulfiram; CBT without disulfiram; TSF without disulfiram. MEASUREMENTS: Percentage of days of cocaine and alcohol use during follow-up, verified by urine toxicology screens and breathalyzer tests. RESULTS: First, as a group, participants reported significant decreases in frequency of cocaine, but not alcohol, use after the end of treatment. Secondly, the main effects of disulfiram on cocaine and alcohol use were sustained during follow-up. Finally, initiation of abstinence for even brief periods of time within treatment was associated with significantly better outcome during follow-up. CONCLUSIONS: These findings support the efficacy of disulfiram with this challenging population and suggest that comparatively brief treatments that facilitate the initiation of abstinence may have long-term benefits.

Adult↗

[Fulminant hepatitis caused by disulfiram].

After undergoing withdrawal treatment for alcoholism as an in-patient for one year a 49-year-old woman was started on disulfiram, 250 mg daily, her liver function tests being normal. Except for vitamin B1 she received no further medication. Jaundice developed 13 days after onset of treatment and acute liver failure was diagnosed on the 18th day after a total disulfiram dose of 4.5 g (Quick value < 10%; bilirubin 460 mumol/l; GPT 5099 U/l; GOT 4142 U/l), as well as early renal failure (creatinine 300 mumol/l). An acute viral infection, autoimmune hepatitis and a metabolic liver disease were excluded by biochemical, serological and molecular biology tests. All toxicological tests were negative. The patient died 25 days after the onset of disulfiram treatment in hepatic coma due to a fulminant hepatitis with hepatorenal syndrome. Both a liver biopsy and the autopsy showed the signs of an acute hepatic dystrophy without cirrhosis. The temporal relationship between the disulfiram intake and onset of the illness, the exclusion of other causes of the fulminant hepatitis and the liver histology, which was compatible with a chemical-toxic hepatitis, indicate that this was a case of disulfiram-induced hepatitis. The hepatotoxicity of disulfiram is a very rare idiosyncratic reaction which is often fatal. Disulfiram administration must be discontinued at once if there is a rise in liver enzyme activity or jaundice occurs.

Alcoholism↗

The clinical use of disulfiram (Antabuse): a review.

Disulfiram is a potent alcohol-sensitizing drug, the effectiveness of which remains unproven in the treatment of alcoholism after 40 years of use. Its clinical utility is more closely associated with nonspecific, nonpharmacological factors (such as social class, patient compliance, patient personality characteristics, and treatment structure) than with its aversive biochemistry. Disulfiram is not effective as a sole alternative to a structured treatment program. Disulfiram retains a place in standard alcoholism treatment programs because clinicians have found this agent useful for selected alcoholic patients. Clinical studies and clinical lore describe these patients as older, relapse-prone, socially stable, cognitively intact, not depressed, compulsive, capable of following rules, and tolerant of dependence. Another distinctly responsive (but evasive) group is court-probated patients. These characteristics also describe patients who are well-known to have good outcomes without disulfiram, thus they do not help clinicians to select suitable patients for this medication. Consequently, this article proposes the following selection criteria: (1) patients who can tolerate a treatment relationship; (2) patients who are relapse-prone (but in treatment); (3) patients who have failed with less structured approaches; (4) patients in early abstinence who are in crisis or under severe stress; (5) patients in established recovery for whom individual or group psychotherapy is a relapse risk; and (6) patients who specifically request it. With or without disulfiram, a treatment program needs to be highly structured and predictable in order to be useful to newly recovering patients. Recovery is a process with discernible phases of development, and the provision of structure is the core of early treatment, where behavior change is more important than insight. A well-structured program will have phases through which a patient may progress. Generally speaking, disulfiram is most useful early to establish sobriety and to allow time for other support structures, such as AA, therapist-patient relationships, and new personal relationships, to take hold. Disulfiram is best given to patients with prior treatment failures, early in treatment, briefly during crises in established sobriety, or to support unusual stresses, such as psychotherapy. Prescriptions should be short-term and not allow automatic refills. It should be necessary to attend a treatment program in order to obtain them. Supervision and monitoring dramatically increase compliance.(ABSTRACT TRUNCATED AT 400 WORDS)

Alcoholism↗

A one-year pragmatic trial of naltrexone vs disulfiram in the treatment of alcohol dependence.

AIMS: To compare the efficacy of naltrexone and disulfiram in preventing an alcoholic relapse in routine clinical practice in an Indian metropolis. METHODS: Hundred alcohol-dependent men, for whom a family member would accompany the patient to follow-up appointments, were randomly allocated to a year of treatment with either naltrexone or disulfiram. Patients, the accompanying family member and the treating psychiatrist were aware of the nature of treatment given. Alcohol consumption, craving and adverse events were recorded weekly for the first three months, then fortnightly for the rest of the year, by the treating psychiatrist. Serum gamma-glutamyl transferase (GGT) was measured at the start and the end of the study. RESULTS: At the end of the year, 97 patients were still in contact. Relapse, the consumption of >5 drinks (40 g of ethanol) in a 24 h period, occurred at a mean of 119 days with disulfiram and at 63 days with naltrexone (P = 0.020). Mean serum GGT, which had not differed between the two groups initially, was 117 U/l with naltrexone and 85 U/l with disulfiram (P = 0.038) at the end of the study. Eighty-six per cent of the patients remained abstinent throughout the study with disulfiram compared to 44% with naltrexone (P = 0.0009). However, patients allocated to naltrexone had significantly lower craving than those allocated to disulfiram. CONCLUSIONS: Disulfiram is superior to naltrexone in preventing a relapse among alcohol-dependent men with family support. Comparison between these treatments in other settings and in different types of alcoholics is warranted.

Adult↗

Phase I study of the combination of disulfiram with cisplatin.

In light of preclinical evidence that disulfiram and related compounds decrease the toxicity and increase the therapeutic index of cisplatin, 12 patients were treated with a combination of cisplatin and oral disulfiram to determine the maximum tolerated dose of disulfiram that could be combined with cisplatin 100 mg/m2, and to determine the dose-limiting toxicity of disulfiram in this combination. Reversible confusion was the dose-limiting toxicity at a disulfiram dose of 3,000 mg/m2 administered 1 h before the end of a 2-h cisplatin infusion. A randomized study of cisplatin with or without disulfiram 2,000 mg/m2 p.o. is currently being conducted to determine the effect of disulfiram on cisplatin toxicity and pharmacology.

Antineoplastic Combined Chemotherapy Protocols↗

Effects of oral administration or implantation of disulfiram on aldehyde dehydrogenase activity in human blood.

The general characteristics of the NAD-dependent aldehyde dehydrogenase (ALDH) present in blood were examined to find suitable assay conditions for activity measurements with whole blood samples from disulfiram-treated patients. The ALDH activity was measured as the rate of acetaldehyde disappearance. The ALDH activity in blood from alcoholics before disulfiram treatment was 39% lower than that found in blood from control subjects. Disulfiram caused a decreased ALDH activity in vitro. Similarly, a decreased activity was found in blood from patients treated with disulfiram orally (400 mg/day). The activity declined to a level being 60% of the control activity during the first week of treatment. A significant inhibition was observed 1 week after the treatment was discontinued. Implantation of 1 g of disulfiram in patients pretreated for 10 days with oral disulfiram did not cause a delayed return of ALDH activity, suggesting that the amounts of disulfiram released were too low to affect the ALDH activity in blood.

Acetaldehyde↗

The pharmacology and toxicology of disulfiram and its metabolites.

Disulfiram (Antabuse) is one of several aldehyde dehydrogenase (ALDH) inhibitors that raise the plasma level of acetaldehyde following ethanol ingestion. The usually pleasant reaction to ethanol is thereby changed to an unpleasant one, owing to a number of bodily reactions to acetaldehyde. Populations showing genetic polymorphism with a lack of some isozymes of ALDH have exhibited an intolerance to ethanol similar to that seen with disulfiram. A normal isozyme pattern seems to be a prerequisite for the development of alcoholism, which supports the principle of disulfiram treatment. Disulfiram is an irreversible ALDH inhibitor when administered in vivo. Diethylthiomethylcarbamate (Me-DTC) is formed from disulfiram in three metabolic steps. This compound and two further oxidized metabolites appear to be active metabolites of disulfiram. Measurements of plasma Me-DTC or the reduction of leucocyte ALDH 1 activity may be valuable markers for the proper dose titration of disulfiram and the rational use of this drug. Some toxicological points are discussed.

Acetaldehyde↗

Depot preparations of disulfiram: experimental and clinical results.

Patient compliance with disulfiram is a troublesome clinical problem. Several strategies have been proposed as a solution to the problem, including subcutaneous implantation of disulfiram. However, well controlled studies of alcoholics and healthy volunteers have failed to discover a pharmacological effect of implanted disulfiram. A major reason for this failure appears to be poor absorption from an inadequate dose. Assessment of new sustained release formulation of depot disulfiram has been found to provoke a mild disulfiram-ethanol reaction (DER). Only a more severe DER would be expected to deter further drinking. If problems with absorption and appropriate dosing of disulfiram can be resolved or a depot preparation of the active metabolite of disulfiram can be prepared, implants might find continued clinical use.

Administration, Cutaneous↗

On the disulfiram-like effect of coprine, the pharmacologically active principle of Coprinus atramentarius.

Coprine or disulfiram was given to rats in various doses at various time intervals before the administration of 2 g/kg ethanol. The ratio acetaldehyde/ethanol in the alveolar air was measured by gas chromatography and was taken as an index of the aldehyde dehydrogenase (ALDH) activity. The activity of dopamine beta-hydroxylase (DBH) was estimated in the same animals by measuring the amount of 14C-octopamine formed from 14C-tyramine in the heart. Coprine and disulfiram both caused an increase in the acetylaldehyde/ethanol ratio, coprine being more potent than disulfiram. Disulfiram, but not coprine, reduced the net yield of 14C-octopamine. In rats pretreated with either coprine or disulfiram, blood-pressure and heart-rate were recorded before and after intraperitoneal injections of 0.4 g/kg ethanol. In both cases ethanol caused a marked and rapid fall in blood-pressure. However, this effect was accompanied by tachycardia only in animals treated with coprine. It is concluded that coprine like disulfiram inhibits ALDH, but only disulfiram causes an additional inhibition of DBH. This difference may account for differences in the cardiovascular response to ethanol.

Agaricales↗

Drug interaction effects on antitumour drugs (XV): Disulfiram as protective agent against cyclophosphamide-induced urotoxicity without compromising antitumour activity in mice.

The prevention of cyclophosphamide-induced urotoxicity by disulfiram was studied in mice. A single dose of cyclophosphamide (100-400 mg/kg, intraperitoneally) produced a significant dose-dependent increase in urinary bladder weight within 48 hr of treatment. Disulfiram prevented cyclophosphamide-induced bladder damage in a dose-dependent manner in mice when orally administered simultaneously with antitumour agents, but failed to diminish the acute toxicity, leukocytotoxicity and immunotoxicity of cyclophosphamide. The protective effect of disulfiram on the bladder was critically dependent on administration timing. Oral administration of disulfiram between 60 min. before and 60 min. after the injection of cyclophosphamide was found to be effective. The optimum time was simultaneous administration of both drugs. Diethyldithiocarbamate and carbon disulfide, metabolites of disulfiram, prevented cyclophosphamide-induced bladder damage when administered simultaneously with cyclophosphamide 1 to, 3 or 5 hr afterwards. Disulfiram slightly potentiated the antitumour activity of cyclophosphamide against Sarcoma 180 or EL-4 leukaemia in vivo when administered simultaneously with cyclophosphamide. In contrast, diethyldithiocarbamate or carbon disulfide did not interfere with cyclophosphamide antitumour activity when administered 3 hr after cyclophosphamide. From these preliminary studies, disulfiram appears to be a likely candidate for protection against cyclophosphamide-induced urotoxicity without compromising the therapeutic utility of the alkylating agent.

Administration, Oral↗

Inhibition of invasion and angiogenesis by zinc-chelating agent disulfiram.

Cell invasion and angiogenesis are crucial processes in cancer metastasis that require extracellular matrix (ECM) degradation. Proteolytic degradation of the ECM components is a central event of invasion and angiogenesis processes. During these processes, matrix metalloproteinases (MMPs) seem to be primarily responsible for much of the ECM degradation. Disulfiram is frequently used in the treatment of alcoholism and has been reported to possess antiretroviral activity and can eject intrinsic zinc out of human immunodeficiency virus (HIV) nucleocapsid protein. In this report, we show that disulfiram inhibited invasion and angiogenesis in both tumor and endothelial cells at nontoxic concentrations. The 3H-labeled type IV collagen degradation assay suggested that disulfiram has type IV collagenase inhibitory activity, and this inhibition was responsible for blocking invasion and angiogenesis through cell-mediated and non-cell-mediated pathways. However, the mechanisms underlying cell-mediated signal pathways are not fully characterized. Our data demonstrate that the non-cell-mediated pathway is dominant. Thus, disulfiram could directly interact with MMP-2 and MMP-9 and inhibit their proteolytic activity through a zincchelating mechanism. Addition of zinc could reverse the inhibition of invasiveness and collagenase inhibition through disulfiram treatment. This finding implies that MMP-2 and MMP-9 may be the inhibitory targets for a potential disulfiram treatment. These observations raise the possibility clinical therapeutic applications for disulfiram used as a potential inhibitor of metastatic cell invasion and angiogenesis.

Animals↗

Psychiatric complications of disulfiram treatment.

The authors studied psychiatric complications of disulfiram use in 605 alcoholic patients. The subjects were assigned to one of three treatment groups: a 250-mg disulfiram group (N = 202), a 1-mg disulfiram group (N = 204) to control for the fear of the alcohol-disulfiram reaction, and a no-disulfiram group (N = 199) to control for the effect of psychotherapy. No significant differences in the incidence of psychiatric complications were found among the three groups. The authors conclude that if psychiatric complications follow disulfiram use, the incidence must be very low with the doses of disulfiram used presently and in the absence of predisposing factors.

Alcoholism↗

Disulfiram-ethanol induced delirium.

OBJECTIVE: To report a case of delirium, without major autonomic symptoms, as the primary manifestation of concomitant use of alcohol while taking disulfiram. CASE SUMMARY: A 50-year-old white woman with a history of bipolar disorder, type I, and alcohol dependence being treated with disulfiram was admitted to an inpatient psychiatric unit with a three- to four-day history of a change in mental status, including deficits in orientation, concentration, and visual hallucinations. Significant finding on review of systems included the spurious report of a 9.1-kg weight loss. Tachycardia and nonfocal neurologic signs on physical examination were also noted. Extensive metabolic, infectious, and neurologic work-up revealed no abnormalities that alone could explain the patient's acute confusional state. It was subsequently discovered that the patient had imbibed alcohol on at least two separate occasions while taking disulfiram prior to her change in mental status and that a similar, although shorter, experience had occurred previously. DISCUSSION: This is the first case, to the authors' knowledge, that describes an acute confusional state as the primary manifestation of a patient taking alcohol while being prescribed disulfiram as aversive therapy for alcohol abuse. Possible pathophysiologic mechanisms for delirium as a complication of alcohol ingestion while taking disulfiram include disturbances in various neuroendocrine axes, neurotransmitter systems, and metabolic derangements. Other reports of possible neuropsychiatric complications of disulfiram therapy are also reviewed. CONCLUSIONS: The differential diagnosis for the presentation of delirium in a patient known to be undergoing aversive therapy for alcohol dependence with disulfiram should include nonadherence to alcohol abstinence.

Alcohol Deterrents↗

Assessment of intramuscular emulsified disulfiram in alcoholics by estimation of urinary diethylamine.

Five alcoholics administered 1 g of disulfiram in soybean emulsion by deep intramuscular injection were found to have insignificant urinary levels of disulfiram metabolites compared with five patients on oral disulfiram. Disulfiram administered in this way is unlikely to produce a significant reaction with ethanol, but its value as a placebo should not be discounted. In this pilot trial, the technique caused moderate local and systemic reactions and possible hepatic toxicity. Although in other respects the method is superior to surgical implants, modification of dosage and vehicle will be necessary, and the high incidence and severity of side effects preclude further clinical use of disulfiram in this form. Based on the work of Gordis and Peterson, a qualitative and quantitative thin-layer chromatographic urine assay method for the disulfiram metabolite diethylamine, measured as cupric diethyldithiocarbamate, was developed. This is practicable in a hospital laboratory situation and has application for compliance testing in patients on oral disulfiram.

Administration, Oral↗

Anxiogenic effect of disulfiram evaluated in an animal model.

The present experiment was designed to determine whether disulfiram produced an interoceptive discriminative stimulus (IDS) in rats similar to that exhibited by the anxiogenic drug pentylenetetrazol (PTZ). Rats were trained to discriminate PTZ (20 mg/kg IP) from saline, according to an FR10 schedule of food reinforcement. After training criteria had been met, discrimination testing revealed that disulfiram (100 mg/kg, IP) produced a PTZ-like IDS that fully substituted for PTZ 4 hours after injection, decaying to baseline values by the third day. The metabolite of disulfiram, diethyl dithiocarbamate (100 mg/kg, IP), followed much the same temporal pattern, but only showed partial substitution for PTZ. When ethanol (1 g/kg, gavage) or the monoamine oxidase inhibitor pargyline (50 mg/kg, IP) were administered in combination with disulfiram, no significant change of the PTZ-like stimulus was observed. Pargyline (100 mg/kg, IP) or acetaldehyde (200 mg/kg, IP), given alone, did not significantly substitute for PTZ. These data show that disulfiram produces an IDS in rats similar to that produced by other anxiogenic drugs. These data also suggest that the mechanism by which disulfiram produces its anxiogenic effect may not be entirely based upon the disulfiram metabolite diethyl dithiocarbamate, elevated acetaldehyde levels or stimulation of the catecholaminergic system.

Acetaldehyde↗