Well, on a medical journal which can be found at
http://www.medscapex.com/viewarticle/719038_2
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For post operative pain relief they administerd 0.3 mcg/kg (or 0.13636 mcg/lb). I believe this dose may have been calculated on patients with a lack of tolerance. DO NOT TAKE A RISK however and before you even dose to this amount try a quarter of the dose, than half, than 3/4 and so on. You can always have a chance to do more, you don't always have a chance to do less!!
This is the dose chart for post operative pain relief from the journal. I just put some average masses to easily see where you might be at.
Dosage Chart
mass(lb) sulfentanyl
120.........16.4mcg
130.........17.7mcg
140.........19.1mcg
150.........20.5mcg
160.........21.8mcg
170.........23.2mcg
180.........24.5mcg
190.........25.9mcg
200.........27.3mcg
On another journal I read they compared fentanyl and sufentanyl for anesthesia and the result was 2.32mcg/lb of sulfentanyl for unconsciousness on average, while it took 12.27mcg/lb of fentanyl for unconsciousness on average. Therefore I derive a (1 : 5.29) ratio of sulfentanyl to fentanyl.
So if you can assume that you can take around your average dose of fentanyl and divide it by about 5, and you will come up with a dose of sufentanyl that will be about just as effective. To start I would maybe divide my fentanyl dose by around 8 or 9 as to ensure that you do not overdose due to the cross-tolerance. There is a chance that if you take fentanyl a lot you may build a tolerance of the drug itself and your tolerance to fentanyl itself will be higher than your tolerance to all other opioid drugs. So if we add this information to the chart above we will be able to come up with an average comparison of doses
*using the (1:5.29) sufentanyl to fentanyl ratio
Dosage Chart
mass(lb) sulfentanyl......fentanyl
120............16.4mcg.....86.8mcg
130............17.7mcg.....93.6mcg
140............19.1mcg.....101.1mcg
150............20.5mcg.....108.4mcg
160............21.8mcg.....115.3mcg
170............23.2mcg.....122.7mcg
180............24.5mcg.....129.6mcg
190............25.9mcg.....137.0mcg
200............27.3mcg.....144.4mcg