Mal548, I empathize with your situation; I've lost count of my addictions. Benzo's, opiates (oxycodone, morphine, pethidine, pentazocine [Fortral, Talwin], dextropropoxyphene [Doloxene], non-barbiturate tranq's ( glutethemide [Doriden] and meprobamate [Equanil] and good old DHC.
In Australia you can purchase Rikodeine - a cough suppressant which contains DHC as the sole active drug; 1.9mg:1 ml ratio. Depending on a multitude of factors including whether you look like a junkie, they may ask for photo ID. Name and address are recorded to track sales IN THAT PARTICULAR pharmacy only.
Too many requests in too short a timeframe and the response will invariably be 'we don't stock/we are out of stock of that particular cough medicine.' So Mr Junkie has to visit many pharmacies.
For someone who has no opiate tolerance 30-40 mls (60 -80 mg ) will produce a cheap, very nice high which is relatively long-lasting (4-6 hours) and relatively safe if not mixed with other drugs. If you take much more than that you may end up with severe gas/wind/farts and/or diarrhea. This isn't due to the DHC but the sorbitol they add to deter abuse.
The doses and formulations mentioned in your post are a little confusing. I think you mean mg instead of ml. Codydramol is not available in Australia but from what I read it is combined with paracetamol in amounts ranging from 10mg - 30mg per tablet x 24.
The total amount of DHC is important to you in terms of reduction though the exact amount isn't important for the sake of this information.
One important component of this to take into account is the paracetamol or acetaminophen as it is named in US. This drug can damage the liver when taken in single, large amounts i.e. unsuccessful suicide and accidental poisonings. Also when taken in usual doses over a long period of time.
Doctors usually start seeing liver problems in people who have ingested a total paracetamol/acetaminophen amount of 1 Kilogram. That is 1000 x 1000 mg. As the typical single dose unit is 500mg, that equates to 2000 tablets. It would take a little over 5.5 years to reach 1 Kg if you took 1 tablet per day. As you are taking many times that amount, well you can do the sums and scare yourself, which may proved constructive....but you get the idea. If nothing else,drink plenty of water and take plenty of antioxidant supplements to minimise the potential damage.
As for going cold-turkey, I wouldn't recommend it. As with other opiates, you will experience all the typical withdrawal symptoms: aches and pains throughout your body, really bad diarrhea, goose-flesh (they call it going 'cold-turkey' for a reason), involuntary leg-kicking motion when sitting or in bed ('kicking' the habit ). Headaches, no appetite, runny nose, sneezing, no or very little energy. And all you will think about is how you can stop it all just by taking a little DHC. Make sure you have NONE where you're living.
You're basically going to feel like you have a really bad case of Flu and that's what it will basically look like to anyone who does not know what's going on.
You can use this to your advantage if you are working and require a little sick-leave.
It will be a lot easier physically if you slowly reduce your DHC intake slowly over the course of 2-3 weeks. The slower the better though some people prolong it so they are still taking SOME DHC, no matter how small the dose. It is better to make up a schedule and stick to that.
This is definitely easier physically though it can be psychological torture if you have no-one else for support and to keep and administer the drug. You WILL be want so badly to take that extra tab and 'feel OK' again. And you will not be the first one to relent and give-in. If you have no close friends/relatives you're able to trust with this support then the next-best option is to use the wide range of facilities and organisations who are experts in this field.
At the very least I would let your own doctor know about what you intend to do. He may be able to provide help/alternate solutions. See if will prescribe some diazepam [Valium] to ease the withdrawal discomfort.
You just have to form a plan, stick to the plan and believe you can do it. Usually the biggest obstacle to dislodging the monkey from your back is that you convince yourself you are unable to do it.
And the thought of going without those chemicals which have been an integral part of your life for so long seems impossible.
Like with most other things in life which appear insurmountable, when you actually do it,complete it successfully and then look back and think, that wasn't that hard, was it?
The hard part is staying clean.
All the best anyway...know you can do it!
Cheers
syclik