The evidence for baclofen in alcohol dependence

Are there reliable studies that back its use in a 35-year-old patient?

Clinical scenario

Jorge, an unemployed 35-year-old factory worker with alcohol dependence, saw me recently at the local health district GP unit. 

As we talked about his drinking, I recalled a conference presentation on the use of baclofen as a treatment for alcohol use disorders.  What is the evidence for this therapy?