4-Fluorophenibut (developmental code name CGP-11130; also known as β-(4-fluorophenyl)-γ-aminobutyric acid or β-(4-fluorophenyl)-GABA) is a GABAB receptor agonist which was never marketed.[1] It is selective for the GABAB receptor over the GABAA receptor (IC50 = 1.70 μM and > 100 μM, respectively).[1] The drug is a GABA analogue and is closely related to baclofen (β-(4-chlorophenyl)-GABA), tolibut (β-(4-methylphenyl)-GABA), and phenibut (β-phenyl-GABA).[1] It is less potent as a GABAB receptor agonist than baclofen but more potent than phenibut.[1]
The substance is sometimes referred to as 4F-phenibut, F-phenibut, or baflofen, and colloquially as fluorobut.
Legal status
F-Phenibut is a prohibited substance in Lithuania[2] and Hungary.[3]
References
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| Ionotropic | | GABAATooltip γ-Aminobutyric acid A receptor | 
- Positive modulators (abridged; see here for a full list): α-EMTBL
 
- Alcohols (e.g., drinking alcohol, 2M2B)
 
- Anabolic steroids
 
- Avermectins (e.g., ivermectin)
 
- Barbiturates (e.g., phenobarbital)
 
- Benzodiazepines (e.g., diazepam)
 
- Bromide compounds (e.g., potassium bromide)
 
- Carbamates (e.g., meprobamate)
 
- Carbamazepine
 
- Chloralose
 
- Chlormezanone
 
- Clomethiazole
 
- Dihydroergolines (e.g., ergoloid (dihydroergotoxine))
 
- Etazepine
 
- Etifoxine
 
- Fenamates (e.g., mefenamic acid)
 
- Flavonoids (e.g., apigenin, hispidulin)
 
- Fluoxetine
 
- Flupirtine
 
- Imidazoles (e.g., etomidate)
 
- Kava constituents (e.g., kavain)
 
- Lanthanum
 
- Loreclezole
 
- Monastrol
 
- Neuroactive steroids (e.g., allopregnanolone, cholesterol, THDOC)
 
- Niacin
 
- Niacinamide
 
- Nonbenzodiazepines (e.g., β-carbolines (e.g., abecarnil), cyclopyrrolones (e.g., zopiclone), imidazopyridines (e.g., zolpidem), pyrazolopyrimidines (e.g., zaleplon))
 
- Norfluoxetine
 
- Petrichloral
 
- Phenols (e.g., propofol)
 
- Phenytoin
 
- Piperidinediones (e.g., glutethimide)
 
- Propanidid
 
- Pyrazolopyridines (e.g., etazolate)
 
- Quinazolinones (e.g., methaqualone)
 
- Retigabine (ezogabine)
 
- ROD-188
 
- Skullcap constituents (e.g., baicalin)
 
- Stiripentol
 
- Sulfonylalkanes (e.g., sulfonmethane (sulfonal))
 
- Topiramate
 
- Valerian constituents (e.g., valerenic acid)
 
- Volatiles/gases (e.g., chloral hydrate, chloroform, diethyl ether, paraldehyde, sevoflurane)
  
- Negative modulators: 1,3M1B
 
- 3M2B
 
- 11-Ketoprogesterone
 
- 17-Phenylandrostenol
 
- α3IA
 
- α5IA (LS-193,268)
 
- β-CCB
 
- β-CCE
 
- β-CCM
 
- β-CCP
 
- β-EMGBL
 
- Anabolic steroids
 
- Amiloride
 
- Anisatin
 
- β-Lactams (e.g., penicillins, cephalosporins, carbapenems)
 
- Basmisanil
 
- Bemegride
 
- Bicyclic phosphates (TBPS, TBPO, IPTBO)
 
- BIDN
 
- Bilobalide
 
- Bupropion
 
- CHEB
 
- Chlorophenylsilatrane
 
- Cicutoxin
 
- Cloflubicyne
 
- Cyclothiazide
 
- DHEA
 
- DHEA-S
 
- Dieldrin
 
- (+)-DMBB
 
- DMCM
 
- DMPC
 
- EBOB
 
- Etbicyphat
 
- FG-7142 (ZK-31906)
 
- Fiproles (e.g., fipronil)
 
- Flavonoids (e.g., amentoflavone, oroxylin A)
 
- Flumazenil
 
- Fluoroquinolones (e.g., ciprofloxacin)
 
- Flurothyl
 
- Furosemide
 
- Golexanolone
 
- Iomazenil (123I)
 
- IPTBO
 
- Isopregnanolone (sepranolone)
 
- L-655,708
 
- Laudanosine
 
- Lindane
 
- MaxiPost
 
- Morphine
 
- Morphine-3-glucuronide
 
- MRK-016
 
- Naloxone
 
- Naltrexone
 
- Nicardipine
 
- Nonsteroidal antiandrogens (e.g., apalutamide, bicalutamide, enzalutamide, flutamide, nilutamide)
 
- Oenanthotoxin
 
- Pentylenetetrazol (pentetrazol)
 
- Phenylsilatrane
 
- Picrotoxin (i.e., picrotin, picrotoxinin and dihydropicrotoxinin)
 
- Pregnenolone sulfate
 
- Propybicyphat
 
- PWZ-029
 
- Radequinil
 
- Ro 15-4513
 
- Ro 19-4603
 
- RO4882224
 
- RO4938581
 
- Sarmazenil
 
- SCS
 
- Suritozole
 
- TB-21007
 
- TBOB
 
- TBPS
 
- TCS-1105
 
- Terbequinil
 
- TETS
 
- Thujone
 
- U-93631
 
- Zinc
 
- ZK-93426
  
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 | GABAA-ρTooltip γ-Aminobutyric acid A-rho receptor |  | 
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| Metabotropic | | GABABTooltip γ-Aminobutyric acid B receptor | 
- Negative modulators: Compound 14
  
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- See also
 
- Receptor/signaling modulators 
 
- GABAA receptor positive modulators 
 
- GABA metabolism/transport modulators 
  
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