“…Dopaminergic Agents. Therapeutics such as methylphenidate and other medications (e.g., bromocriptine, pergolide, and amantadine), which act as dopamine agonists, also show limited efficacy in the treatment of cocaine addiction (Khantzian et al, 1984;Grabowski et al, 1997;Handelsman et al, 1997;Malcolm et al, 2000;Shoptaw et al, 2002). The efficacy of methylphenidate, however, may be apparent only in cocaine addicts with comorbid attention deficit/hyperactivity disorder rather than cocaine addicts in general (Gawin et al, 1985;Levin et al, 1998;Schubiner et al, 2002).…”