Patients with comorbid cocaine and alcohol dependence have a worse prognosis with lack of adherence to follow-up and treatment, frequent psychosocial problems, and higher rates of relapse [1]. Concurrent use of both substances produces cocaethylene, which is associated with more toxicity than cocaine alone [2].

To determine the efficacy of disulfiram compared to nalmefene in the treatment of comorbid cocaine and alcohol use.

A quasi-experimental open study was designed on 41 outpatients, with a follow-up of at least 1 year at the Mental Health Unit, aged between 18 and 65 years, diagnosed with cocaine and alcohol dependence (ICD-10). A minimum simultaneous weekly consumption of 2 grams of cocaine and 12 SD (Standard Drink) of alcohol during the month before, described by self-records was established. Treatment with oral disulfiram 250mg/day was assigned to 21 patients, and with oral nalmefene 18mg/day to 20 individuals. Observation period was for 6 months. Urinalysis and alcohol breath test were carried out twice a week. Abstinence was defined by obtaining negative results for at least 4 consecutive weeks. Statistical analysis were performed using SPSS v21.0 (significance p<0.05).

61.9% of patients treated with disulfiram achieved a minimum of 4 consecutive weeks of abstinence from cocaine and alcohol, compared to 40% in the nalmefene group (χ²=1.188; gl=1; p=0.276). There were no significant differences.

Disulfiram or nalmefene monotherapy seems clinically ineffective or insufficient in reducing the combined use of cocaine and alcohol. Further research is needed to assess the effect of both drugs simultaneously.

No significant relationships.