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Created Dec 2020


  • [4-Cl-iBF]


DEA CODE 9826: Schedule 1 Narcotic

Para-Chloro Isobutyryl Fentanyl

An analytical reference material that is structurally similar to known opioids; regulated as a Schedule I compound in the United States; intended for research and forensic applications,

A reddit thread:
I've got my hands on a fentanyl analog by the name of 4-CL-iBF. I've never tried this analog nor any other fentanyls for that matter. How would you recommend me to approaching this substance? What is the dosing, and how should I dose it? I do not have any access to syringes unfortunatelly, so that is atleast out of the picture. I did some Google searches, but I could not find anyone that could give some propper advice with this analog, so any experience/advice (mainly dosage) would be greatly appriciated.

WARNING: This product is not for human or veterinary use.

Caymanchem PDF Para-Chloroisobutyryl fentanyl

An opioid analgesic that is an analog of fentanyl, and has been sold online as a designer drug. Side effects of fentanyl analogs are similar to those of fentanyl itself, which include itching, nausea and potentially serious respiratory depression, which can be life-threatening. Fentanyl analogs have killed hundreds of people throughout Europe and the former Soviet republics since the most recent resurgence in use began in Estonia in the early 2000s, and novel derivatives continue to appear. A new wave of fentanyl analogues and associated deaths began in around 2014 in the US, and have continued to grow in prevalence; especially since 2016 these drugs have been responsible for hundreds of overdose deaths every week.

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