You're going to have very little to barely any physical withdrawal imo - 200mgs per day usually only 3 days in a row with usually 7 days till your next 3 day run. Gosh I wish that's what I was facing, and not to take away from your situation GP82 as you certainly have a codeine habit, but those 3 day runs with double the time off in between are going to save you some pain for sure, even if you were 3 days on 3 days off I would be thankful my habit hadn't gotten worse.
You've managed to keep at 200mgs per day in roughly the schedule you've described for years, lets say 3 years, well with that there is great hope but also potential peril. Many of us around here and I put myself in this camp, had we come across oxy, morphine then heroin, we would have hurt the crap out of those drugs within the first year of our opiate habits no doubt in my case. The fact that you haven't done this helps us gauge where you're at with regards to both physical and psychological addiction and should be encouraging to you that firstly you are not completely totally owned by codeine otherwise your habit would be a lot larger lets say 600mgs per day and secondly you are not dosing every single day without fail.....So....
*How do you feel physically on your days off in between your runs of codeine?
*Do you have strong mental cravings for your next run? I suggest not because of the off days and dosage but I'm interested to know more about you with respect to willpower.
*Do you think you would have taken stronger medications such as oxycodone and morphine if presented with the opportunity?
*Have you ever been presented with the opportunity to take these stronger medications?
Hope I haven't freaked you out with all these questions, feel free to disregard them, but It would be good information, thank you for sharing and take care GP82.
Edit: Oh yes I forgot, the great potential peril I mentioned is obvious, you do have a habit, you have formed an addiction cycle, you mentioned that you try not to buy any for a week between runs but if those breaks are getting shorter your dose will likely eventually rise and this can lead to stronger meds being sought out if not already happened across.