I don't know much about codeine, but from what I'm finding on google I'd say start off with about 50-75mg depending on your height and weight. Someone else could probably give a more accurate suggestion, so get a second opinion first.
I get 30mg pills, and I weigh 125. I would take 120mg with no tollerance to the drug. I'd say take about 1mg/lb roughly (but I would probably feel somthing if I only took 100mg of it. Mind you, its better to start alittle higher then a little lower (in this case) because if you underdose with opiates (i find) its a waste of the pills.
with a decent tolerance to oxy and hydro i take 120mg and feel an equivalent of 15mg oxy buzz you could take over 200mg and still function no prob
The first couple times I tried it I did 90mg. 120mg was better. I weigh around 160lbs... Oops, bit of an old thread. OP probably doesn't care anymore...