The implant is actually called Antabuse and if you phone the pharmacutical they can still import it or arrange with a doctor that could help out - at least this is what the process was when I enquired 6 months ago. Sanca Drug and Alcohol Rehabilitation Center Westrand also used to the implant. Failing that, all Sanca Rehabs can dispense the Antabuse tablets (which saves the doctors consultation fees), only catch is you may need to attend an outpatient session or two.
One concern with the implant is that the body can reject it and the pills are literally pushed out from the initial implant site. This is extremely uncomfortable (which is why it is advisable to have it done on your stomach - kind of in line with your belly button) because if they *do* reject you then get to sit on an open wound on your bum. I dont see how that could be fun on any level. If you decide to go for it, have a chat with the doctor / facility arranging it for you and discuss what the waiting period is *after* the implant has run its course (assuming that you decide to continue drinking) as it's not always an exact timeframe - i assume this has something to do with the speed your body will process them at. Drinking too soon can be pretty dangerous - even a sip of the wrong cough medicine or biolpus type stuff can set you back for a day or so.