Buy 4-fluoroisobutyrfentanyl powder Online 4-FIBF


SKU: Buy 4-fluoroisobutyrfentanyl powder Online 4-FIBF Category:
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10 grs $220.00instock
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100 grs $1,600.00instock
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25 mg $500.00instock
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250 grs $3,250.00instock
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50 grs $930.00instock
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500 grs $5,200.00instock
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Buy 4-fluoroisobutyrfentanyl powder

Buy 4-fluoroisobutyrfentanyl powder (also known as 4-FIBF and p-FIBF) is an opioida is an analog of butyrfentanyl and structural isomer of 4-Fluorobutyrfentanyl and has been sold online as a designer drug. It is closely related to 4-fluorofentanyl, which has an EC50 value of 4.2 nM for the human μ-opioid receptor.


Names: 4-Fluoroisobutyrfentanyl para-fluoroisobutyrfentanyl, N-(4-fluorophenyl)-N-(1-phenethylpiperidin 4-yl)isobutyramide pFIBF, 4-FIBF,

IUPAC name: N-(4-fluorophenyl)-N-(1-phenethylpiperidin-4-yl)isobutyramide

Substance group: Other substances

This substance is included in Schedule I of the 1961 Single Convention on Narcotic Drugs


Formula: C23H29FN2O

Molar mass: 368.50 g·mol−1

Side effects

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.


4-Fluoroisobutyrylfentanyl is a Schedule I controlled substance in the United States. In the UK, it is a Class A drug. In Canada, it is a Schedule I drug.

See also

  • 3-Methylbutyrfentanyl
  • 3-Methylfentanyl
  • 4-Fluorofentanyl
  • α-Methylfentanyl
  • Acetylfentanyl
  • Acrylfentanyl
  • Furanylfentanyl
  • List of fentanyl analogues

Fentanyl analogues, in which the N-[1-(2-phenethyl)-4-piperidyl]aniline nucleus has additional radicals, either alone or in combination, attached as follows:

(a) an acetyl, propionyl, butenoyl or butanoyl radical, attached to the aniline nitrogen atom:

(b) 1 or more alkyl radicals, with up to 10 carbon atoms in total, attached to the ethyl moiety:

(c) any combination of up to 5 alkyl radicals and/or alkoxy radicals (each with up to 6 carbon atoms, including cyclic radicals) and/or halogen radicals, attached to each of the benzene rings

fentanyl-related substances includes any substance not otherwise controlled in any schedule…that is structurally related to fentanyl by one or more of the following modifications:

  1. Replacement of the phenyl portion of the phenethyl group by any monocycle, whether or not further substituted in or on the monocycle;
  2. substitution in or on the phenethyl group with alkyl, alkenyl, alkoxyl, hydroxyl, halo, haloalkyl, amino or nitro groups;
  3. substitution in or on the piperidine ring with alkyl, alkenyl, alkoxyl, ester, ether, hydroxyl, halo, haloalkyl, amino or nitro groups;
  4. replacement of the aniline ring with any aromatic monocycle whether or not further substituted in or on the aromatic monocycle; and/or
  5. replacement of the N-propionyl group by another acyl group.


Additional information


10 grs, 100 grs, 25 mg, 250 grs, 50 grs, 500 grs


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