i once helped a friend transition to Bupe from Heroin using Fentanyl but i have never tried it other than cheek a quarter of a 75ug patch.
anyway, this is the ratio:
![](https://forum.drugs-and-users.org/index.php?action=dlattach;topic=4134.0;attach=2584;image)
heroin-fentanyl-demonstrative_lrg-jpg_bat5667.jpg (63.17 kB . 370x247 - viewed 518 times)