thank you for your query... it feels good that a patient has understood the bad effects of addiction and has come forward to leave that habit...my heartiest congratulations for that... now coming to your problem.... pentazocine is sort of a painkiller which is vastly used...you must have got it being a health worker...and pentazocine has a addictive property...there are plentiful cases of pentazocine addiction... well this addiction does not only cause physical dependence, but leads to tolerance to the drug, some serious side effects, withdrawal symptoms and as you are taking the injections, might lead to risk of acquiring transmittable diseases... for pentazocine dependence or addiction, methadone and naloxone can give satisfactory results... but one should personally see the patient before prescribing treatment for addictions... so my advice will be to consult the rehabilitation or anti-addiction centers where they take care of the patients individually and have a very good success rate... hope this was helpful... contact me for any further questions... regards wish you a happy future devoid of addictions