@mike: be really fuckin careful man. If you're intent on doing this, after you get your solution, heed the advice to dose low. Don't "go big or go home" thinking if you under-dose you'll have to wait a few hours to try again. Because the half life is so short, you can easily titrate up to where you want to be. Another aspect to consider: it's so potent that if you haven't felt true withdrawals yet, once you start with the F you def will. And it will fuck your tolerance. Also know that with fentanyl, it will scratch that itch to get dopiated, but it's a much more sedate and not as euphoric. Best advice: find someone willing to trade for your usual DoC. Off my soapbox now, but just wanna give you all the information I can so you can make an informed choice. Take care.