Objective: Aim of this randomized, double-blind, placebo-controlled study was to evaluate the efficacy of Acetyl-l-Carnitine (ALC), at different dosages, on specific anhedonic symptoms in detoxified alcohol dependent subjects. Secondary endpoints were the effect of ALC on melancholic and negative symptoms.
Method: Sixty-four anhedonic alcohol dependent patients with minor or absent withdrawal symptoms were randomized: 23 received ALC at a dosage of 3g/day, 21 received ALC at a dosage of 1g/day, and 20 were given placebo. ALC was given intravenously for 10days, followed by 80days of oral treatment plus a follow-up period of 45days. The presence of anhedonic symptoms was determined by the SHAPS (Snaith-Hamilton Pleasure Scale) and the VASa (Visual Analogue Scale for Anhedonia); negative and melancholic symptoms were evaluated by the SANS (Scale for the Assessment of Negative Symptoms), and the BRMS (Bech-Rafaelsen Melancholia Scale).
Results: The natural course of anhedonia in the placebo group showed a decline until day 30 and remains stable for the rest of the study. Intravenously ALC accelerated the improvement of anhedonia reaching constant low levels early, on day 10. At this step levels of anhedonia (SHAPS, VASa) and melancholic symptoms (BRMES) resulted significantly reduced (p<0.05) in both the ALC 3g and ALC 1g groups with respect to placebo; SANS scores significantly reduced only in the ALC 1g respect to placebo (p=0.014). During oral treatment with ALC, anhedonia scores did not differ from placebo.
Conclusion: Intravenously ALC was effective in accelerating the abstinence-associated improvement of anhedonia, melancholic and negative symptoms, whereas oral ALC treatment starting on day 10 showed no further improvements. Accordingly, in alcohol dependent subjects, ALC may be considered as a new potentially useful drug for the treatment of anhedonia.
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