Et andet klinisk forsøg i Det Forenede Kongerige undersøger effektiviteten af modafinil sammen med kuponbaseret contingency management blandt patienter, der får opioidsubstitutionsbehandling, og som bruger crackkokain.
Another clinical trial in the United Kingdom is investigating the efficacy of modafinil, in conjunction with voucher-based contingency management, among patients receiving opioid substitution treatment and using crack cocaine.