Where/how can I get naltrexone or similar?. Posted 7 months ago. My GP was not impressed by the idea of trying a drugs route to reduce my drinking. So I did as I was told and tried counselling instead (yeh, like dragging up my past is going to help; was actually drinking more by the end of that 6 month stint!!) I have tried. Obtaining Your Prescription – Drinking on Naltrexone or Nalmefene is ‘Good Medicine’.