Suboxone would be my recommendation. (contains nal), Do methadone if you want a worse addiction. Problem I have seen with subs is that users don't take it and trade/sell it so they can buy their dope. Apparently now they have a shot that lasts a month which resolves that problem. In my experience the doc prescribed way more than I needed and I took less than half of the daily dose, slowly weaning myself off. Another negative is that if you have suboxone or nal if you continue to use opiates, both can be used to offset withdraws which are a strong motivator to quit.
Edit: In regards to cold turkey, if you are able to do it more power to you, but the success rate is slim to none for obvious reasons.
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