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Gabapentin enacarbil - Wikipedia

From Wikipedia, the free encyclopedia

Gabapentin prodrug used to treat restless legs syndrome and shingles complications

Pharmaceutical compound

Gabapentin enacarbil (Horizant (ER) (U.S.Tooltip United States), Regnite (in Japan)) is an anticonvulsant and analgesic drug of the gabapentinoid class, and a prodrug to gabapentin.[1] It was designed for increased oral bioavailability over gabapentin,[2][3] and human trials showed it to produce extended release of gabapentin with almost twice the overall bioavailability,[4] especially when taken with a fatty meal.[5] Gabapentin enacarbil has passed human clinical trials for the treatment of restless legs syndrome, and initial results have shown it to be well tolerated and reasonably effective.[6][7][8]

Gabapentin enacarbil was denied approval by the U.S. Food and Drug Administration (FDA) in February 2010, citing concerns about possible increased cancer risk shown by some animal studies. Similar concerns had been raised about gabapentin itself in the past, but were felt to be outweighed by its clinical utility as an anticonvulsant, whereas the treatment of restless legs syndrome was not seen to justify the same kind of risk.[9] On April 6, 2011, Xenoport received FDA approval for Horizant (gabapentin enacarbil) for the treatment of moderate-to-severe restless legs syndrome.[10] On June 7, 2012, the FDA approved Horizant for the treatment of postherpetic neuralgia in adults.[11]

  1. ^ Landmark CJ, Johannessen SI (2008). "Modifications of antiepileptic drugs for improved tolerability and efficacy". Perspectives in Medicinal Chemistry. 2: 21–39. doi:10.1177/1177391X0800200001. PMC 2746576. PMID 19787095.
  2. ^ Cundy KC, Branch R, Chernov-Rogan T, Dias T, Estrada T, Hold K, Koller K, Liu X, Mann A, Panuwat M, Raillard SP, Upadhyay S, Wu QQ, Xiang JN, Yan H, Zerangue N, Zhou CX, Barrett RW, Gallop MA (October 2004). "XP13512 [(+/-)-1-([(alpha-isobutanoyloxyethoxy)carbonyl] aminomethyl)-1-cyclohexane acetic acid], a novel gabapentin prodrug: I. Design, synthesis, enzymatic conversion to gabapentin, and transport by intestinal solute transporters". The Journal of Pharmacology and Experimental Therapeutics. 311 (1): 315–23. doi:10.1124/jpet.104.067934. PMID 15146028. S2CID 1535942.
  3. ^ Cundy KC, Annamalai T, Bu L, De Vera J, Estrela J, Luo W, Shirsat P, Torneros A, Yao F, Zou J, Barrett RW, Gallop MA (October 2004). "XP13512 [(+/-)-1-([(alpha-isobutanoyloxyethoxy)carbonyl] aminomethyl)-1-cyclohexane acetic acid], a novel gabapentin prodrug: II. Improved oral bioavailability, dose proportionality, and colonic absorption compared with gabapentin in rats and monkeys". The Journal of Pharmacology and Experimental Therapeutics. 311 (1): 324–33. doi:10.1124/jpet.104.067959. PMID 15146029. S2CID 25152318.
  4. ^ Cundy KC, Sastry S, Luo W, Zou J, Moors TL, Canafax DM (December 2008). "Clinical pharmacokinetics of XP13512, a novel transported prodrug of gabapentin". Journal of Clinical Pharmacology. 48 (12): 1378–88. doi:10.1177/0091270008322909. PMID 18827074. S2CID 23598218.
  5. ^ Lal R, Sukbuntherng J, Luo W, Huff FJ, Zou J, Cundy KC (February 2010). "The effect of food with varying fat content on the clinical pharmacokinetics of gabapentin after oral administration of gabapentin enacarbil". International Journal of Clinical Pharmacology and Therapeutics. 48 (2): 120–8. doi:10.5414/cpp48120. PMID 20137764.
  6. ^ Merlino G, Serafini A, Lorenzut S, Sommaro M, Gigli GL, Valente M (January 2010). "Gabapentin enacarbil in restless legs syndrome". Drugs of Today. 46 (1): 3–11. doi:10.1358/dot.2010.46.1.1424766. PMID 20200691.
  7. ^ Bogan RK, Bornemann MA, Kushida CA, Trân PV, Barrett RW (June 2010). "Long-term maintenance treatment of restless legs syndrome with gabapentin enacarbil: a randomized controlled study". Mayo Clinic Proceedings. 85 (6): 512–21. doi:10.4065/mcp.2009.0700. PMC 2878254. PMID 20511481.
  8. ^ Imamura S, Kushida C (August 2010). "Gabapentin enacarbil (XP13512/GSK1838262) as an alternative treatment to dopaminergic agents for restless legs syndrome". Expert Opinion on Pharmacotherapy. 11 (11): 1925–32. doi:10.1517/14656566.2010.494598. PMID 20629607. S2CID 27594934.
  9. ^ GlaxoSmithKline/XenoPort: FDA setback halts gabapentin reformulations[permanent dead link]
  10. ^ "XenoPort, Inc. > Investors > RSS Content". Archived from the original on 2012-07-13.
  11. ^ Jeffrey, Susan. "FDA Approves Gabapentin Enacarbil for Postherpetic Neuralgia". Medscape.
Medical uses Anticonvulsants

(

N03

)

GABAergics GABAAR PAMs GABA-T inhibitors Others Channel
modulators Sodium blockers Calcium blockers Potassium openers Others CA inhibitors Others Anxiolytics

(

N05B

)

5-HT1ARTooltip 5-HT1A receptor agonists GABAARTooltip GABAA receptor PAMsTooltip positive allosteric modulators Gabapentinoids
(α2δ VDCC blockers) Antidepressants Sympatholytics
(Antiadrenergics) Others Neuropathic pain

and

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Other

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production
and trade Drug
production Drug trade Issues with
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drug use Ion channel modulators Calcium VDCCsTooltip Voltage-dependent calcium channels Blockers Activators Potassium VGKCsTooltip Voltage-gated potassium channels Blockers Activators IRKsTooltip Inwardly rectifying potassium channel Blockers Activators KCaTooltip Calcium-activated potassium channel Blockers Activators K2PsTooltip Tandem pore domain potassium channel Blockers Activators Sodium VGSCsTooltip Voltage-gated sodium channels Blockers Activators ENaCTooltip Epithelial sodium channel Blockers Activators ASICsTooltip Acid-sensing ion channel Blockers Chloride CaCCsTooltip Calcium-activated chloride channel Blockers Activators CFTRTooltip Cystic fibrosis transmembrane conductance regulator Blockers Activators Unsorted Blockers Others TRPsTooltip Transient receptor potential channels LGICsTooltip Ligand gated ion channels See also: Receptor/signaling modulators • Transient receptor potential channel modulators

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