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Trade namesNeurontin, others[1]
Other namesCI-945; GOE-3450; DM-1796 (Gralise)
  • 1-(Aminomethyl)cyclohexaneacetic acid
Clinical data
Drug classGabapentinoid
Main usesPartial seizures, neuropathic pain, hot flashes, restless legs syndrome[2][3]
Side effectsSleepiness, dizziness[2]
Dependence riskLow
Addiction riskLow
  • AU: B1[4]
  • US: C (Risk not ruled out)[4]
Routes of
By mouth
Defined daily dose1.8 gram[5]
External links
License data
Legal status
Bioavailability27–60% (inversely proportional to dose; a high fat meal also increases bioavailability)[6][7]
Protein bindingLess than 3%[6][7]
MetabolismNot significantly metabolized[6][7]
Elimination half-life5 to 7 hours[6][7]
Chemical and physical data
Molar mass171.240 g·mol−1
3D model (JSmol)
  • InChI=1S/C9H17NO2/c10-7-9(6-8(11)12)4-2-1-3-5-9/h1-7,10H2,(H,11,12) checkY

Gabapentin, sold under the brand name Neurontin among others, is an anticonvulsant medication used to treat partial seizures, neuropathic pain, hot flashes, and restless legs syndrome.[2][3] It is recommended as one of a number of first-line medications for the treatment of neuropathic pain caused by diabetic neuropathy, postherpetic neuralgia, and central neuropathic pain.[8] About 15% of people with diabetic neuropathy or postherpetic neuralgia have a measurable benefit.[9] Gabapentin is taken by mouth.[2]

Common side effects include sleepiness and dizziness.[2] Serious side effects include an increased risk of suicide, aggressive behavior, and drug reactions.[2] It is unclear if it is safe during pregnancy or breastfeeding.[10] Lower doses are recommended in those low kidney function.[2] Gabapentin is a gabapentinoid.[11] It has a molecular structure similar to that of the neurotransmitter γ-aminobutyric acid (GABA) and acts by inhibiting certain calcium channels.[12][11][13]

Gabapentin was first approved for use in 1993.[14][15] It has been available as a generic medication in the United States since 2004.[2] The wholesale price in the developing world as of 2015 was about US$10.80 per month;[16] in the United States, it was US$100 to US$200.[17] In 2017, it was the eleventh most commonly prescribed medication in the United States, with more than 46 million prescriptions.[18][19] During the 1990s, Parke-Davis, a subsidiary of Pfizer, began using a number of illegal techniques to encourage physicians in the United States to use gabapentin for unapproved uses.[20] They have paid out millions of dollars to settle lawsuits regarding these activities.[21]

Medical uses

Gabapentin is approved in the United States to treat seizures and neuropathic pain.[22][23][24] It is primarily administered by mouth, with a study showing that "rectal administration is not satisfactory".[25] It is also commonly prescribed for many off-label uses, such as treatment of anxiety disorders,[26][27] insomnia, and bipolar disorder.[26] About 90% of usage is for off-label conditions.[24] There are, however, concerns regarding the quality of the trials conducted and evidence for some such uses, especially in the case of its use as a mood stabilizer in bipolar disorder.[28]


Gabapentin is approved for treatment of focal seizures[29] and mixed seizures. There is insufficient evidence for its use in generalized epilepsy.[30]


A 2018 review found that gabapentin was of no benefit in sciatica or low back pain.[31] It may be effective in reducing pain and spasticity in multiple sclerosis.[32] The benefit of use immediately after surgery is small if any.[33]

A 2010 European clinical guideline recommended gabapentin as a first-line treatment for diabetic neuropathy, postherpetic neuralgia, or central pain. It found good evidence that a combination of gabapentin with morphine, oxycodone, or nortriptyline worked better than either drug alone; the combination of gabapentin and venlafaxine may be better than gabapentin alone.[8]

A 2017 Cochrane review found evidence of moderate quality showing a reduction in pain by 50% in about 15% of people with postherpetic neuralgia and diabetic neuropathy.[9] Evidence finds little benefit and significant risk in those with chronic low back pain.[34] It is not known if gabapentin can be used to treat other pain conditions, and no difference among various formulations or doses of gabapentin was found.[9]

A 2010 review found that it may be helpful in neuropathic pain due to cancer.[35] It is not effective in HIV-associated sensory neuropathy[36] and does not appear to provide benefit for complex regional pain syndrome.[37]

A 2009 review found gabapentin may reduce opioid use following surgery, but does not help with post-surgery chronic pain.[38] A 2016 review found it does not help with pain following a knee replacement.[39]

It appears to be as effective as pregabalin for neuropathic pain and initially costs less.[40] Both uses are off-patent and their costs are comparable as of 2020. Doses between 900 and 3,600 mg per day appear to result in similar pain relief.[41]


The American Headache Society (AHS) and American Academy of Neurology (AAN) guidelines classify gabapentin as a drug with "insufficient data to support or refute use for migraine prophylaxis".[42] A 2013 Cochrane review concluded that gabapentin was not useful for the prevention of episodic migraine in adults.[43]


Gabapentin has been used off-label for the treatment of anxiety disorders. However, there is dispute over whether evidence is sufficient to support it being routinely prescribed for this purpose.[26][27][44][45] While pregabalin may have efficacy in the treatment of refractory anxiety in people with chronic pain, it is unclear if gabapentin is equally effective.[46] Gabapentin may be useful in the treatment of comorbid anxiety in people with bipolar; however, it is not effective as a mood-stabilizing treatment for manic or depressive episodes themselves.[28][47][48][26]

Drug dependence

Gabapentin may reduce symptoms of alcohol withdrawal (but it does not prevent the associated seizures), alcohol dependence, and craving.[49][50] There is some evidence in the treatment of alcohol use disorder; the 2015 VA/DoD guideline lists gabapentin as a "weak for" and as a second-line agent.[51][52] Use for smoking cessation has had mixed results.[53][54] There is insufficient evidence in cannabis dependence.[55]


Gabapentin may be effective in acquired pendular nystagmus and infantile nystagmus (but not periodic alternating nystagmus).[56][57]

It is effective for treating hot flashes.[58][59][60]

It is an established treatment of restless legs syndrome.[61] Gabapentin may help sleeping problems in people with restless legs syndrome and partial seizures due to its increase in slow-wave sleep and augmentation of sleep efficiency.[62][63][64]

Other psychiatric conditions, such as borderline personality disorder, have also been treated off-label with gabapentin.[24] There is insufficient evidence to support its use in obsessive–compulsive disorder and treatment-resistant depression.[50]

Gabapentin is effective in alleviating itching in kidney failure (uremic pruritus)[65] and itching of other causes.[66] Gabapentin may be an option in essential or orthostatic tremor.[67][68][69] Evidence does not support the use of gabapentin in tinnitus.[70]


The defined daily dose is 1.8 gram by mouth.[5] For post herpetic neuralgia it is generally started at 300 mg the first day and than 300 mg twice per day the second day followed by 300 mg three times per day.[71] For seizures it is generally started at 300 mg three times a day and may be increased to 600 mg three times per day.[71]

Side effects

Gabapentin induced bilateral pitting edema

The most common side effects of gabapentin include dizziness, fatigue, drowsiness, ataxia, peripheral edema (swelling of extremities), nystagmus, and tremor.[15] Gabapentin may also produce sexual dysfunction in some patients, symptoms of which may include loss of libido, inability to reach orgasm, and erectile dysfunction.[72][73] Gabapentin should be used carefully in people with kidney problems due to possible accumulation and toxicity.[15]

Some have suggested avoiding gabapentin in people with a history of myoclonus or myasthenia gravis, as it may induce or mimic the symptoms of these two conditions.[74]


In 2009, the U.S. Food and Drug Administration (FDA) issued a warning of an increased risk of suicidal thoughts and behaviors in patients taking some anticonvulsant drugs, including gabapentin,[75] modifying the packaging inserts to reflect this.[15] A 2010 meta-analysis supported the increased risk of suicide associated with gabapentin use.[76]

Studies have also shown an almost doubled rate of suicidal ideation in patients with bipolar disorder who are taking gabapentin versus those taking lithium.[77]


An increase in formation of adenocarcinomas was observed in rats during preclinical trials; however, the clinical significance of these results remains undetermined. Gabapentin is also known to induce pancreatic acinar cell carcinomas in rats through an unknown mechanism, perhaps by stimulation of DNA synthesis; these tumors did not affect the lifespan of the rats and did not metastasize.[78]


While the mechanisms behind its abuse potential are not well understood, misuse has been recorded across a range of doses, including those that are considered therapeutic.[24] Misuse often coincides with other substance use disorders, most commonly opioids were rates are up to 20%.[52] In the general population rates are around 1%.[52] Mechanistically, the GABAmimetic properties of gabapentin can induce a euphoria that augments the effects of opioids, as well aiding in the cessation of opioid-withdrawal symptoms, such as anxiety.[79]

Misuse has been recorded for a number of reasons, including self-medication, self-harm and recreational use.[24] Withdrawal symptoms, often resembling those of benzodiazepine withdrawal, play a role in the physical dependence some users experience.[80] About 1 percent of the general population and 22 percent of those attending addiction facilities have a history of abuse of gabapentin.[81][82]

Effective July 2017, Kentucky classified gabapentin as a schedule V controlled substance statewide.[83] Effective January 2019, Michigan also classified gabapentin as a schedule V controlled substance.[84] Gabapentin is scheduled V drug in other states such as West Virginia,[85] Tennessee,[86] Alabama[87] Effective April 2019, the United Kingdom reclassified the drug as a class C controlled substances.[88][89][90][91][92]


Tolerance and withdrawal symptoms are a common occurrence in prescribed therapeutic users as well as non-medical recreational users. Withdrawal symptoms typically emerge within 12 hours to 7 days after stopping gabapentin.[81][82] Some of the most commonly reported withdrawal symptoms include agitation, confusion, disorientation, upset stomach and sweating.[81] In some cases, users experienced delirium and withdrawal seizures, which may only respond to the re-administration of gabapentin.[80]


In December 2019, the U.S. Food and Drug Administration (FDA) warned about serious breathing issues for those taking gabapentin or pregabalin when used with CNS depressants or for those with lung problems.[93][94]

The FDA required new warnings about the risk of respiratory depression to be added to the prescribing information of the gabapentinoids.[93] The FDA also required the drug manufacturers to conduct clinical trials to further evaluate their abuse potential, particularly in combination with opioids, because misuse and abuse of these products together is increasing, and co-use may increase the risk of respiratory depression.[93]

Among 49 case reports submitted to the FDA over the five-year period from 2012 to 2017, twelve people died from respiratory depression with gabapentinoids, all of whom had at least one risk factor.[93]

The FDA reviewed the results of two randomized, double-blind, placebo-controlled clinical trials in healthy people, three observational studies, and several studies in animals.[93] One trial showed that using pregabalin alone and using it with an opioid pain reliever can depress breathing function.[93] The other trial showed gabapentin alone increased pauses in breathing during sleep.[93] The three observational studies at one academic medical center showed a relationship between gabapentinoids given before surgery and respiratory depression occurring after different kinds of surgeries.[93] The FDA also reviewed several animal studies that showed pregabalin alone and pregabalin plus opioids can depress respiratory function.[93]


Through excessive ingestion, accidental or otherwise, persons may experience overdose symptoms including drowsiness, sedation, blurred vision, slurred speech, somnolence, uncontrollable jerking motions, anxiety and possibly death, if a very high amount was taken, particularly if combined with alcohol. For overdose considerations, serum gabapentin concentrations may be measured for confirmation.[95]



Gabapentin is a gabapentinoid, or a ligand of the auxiliary α2δ subunit site of certain voltage-dependent calcium channels (VDCCs), and thereby acts as an inhibitor of α2δ subunit-containing VDCCs.[96][11] There are two drug-binding α2δ subunits, α2δ-1 and α2δ-2, and gabapentin shows similar affinity for (and hence lack of selectivity between) these two sites.[11] Gabapentin is selective in its binding to the α2δ VDCC subunit.[96][97] Despite the fact that gabapentin is a GABA analogue, and in spite of its name, it does not bind to the GABA receptors, does not convert into GABA or another GABA receptor agonist in vivo, and does not modulate GABA transport or metabolism.[96][13] There is currently no evidence that the effects of gabapentin are mediated by any mechanism other than inhibition of α2δ-containing VDCCs.[98][96] In accordance, inhibition of α2δ-1-containing VDCCs by gabapentin appears to be responsible for its anticonvulsant, analgesic, and anxiolytic effects.[96][98]

The endogenous α-amino acids L-leucine and L-isoleucine, which closely resemble gabapentin and the other gabapentinoids in chemical structure, are apparent ligands of the α2δ VDCC subunit with similar affinity as the gabapentinoids (e.g., IC50 = 71 nM for L-isoleucine), and are present in human cerebrospinal fluid at micromolar concentrations (e.g., 12.9 μM for L-leucine, 4.8 μM for L-isoleucine).[99] It has been theorized that they may be the endogenous ligands of the subunit and that they may competitively antagonize the effects of gabapentinoids.[99][100] In accordance, while gabapentinoids like gabapentin and pregabalin have nanomolar affinities for the α2δ subunit, their potencies in vivo are in the low micromolar range, and competition for binding by endogenous L-amino acids has been said to likely be responsible for this discrepancy.[98]



Gabapentin is absorbed from the intestines by an active transport process mediated via the large neutral amino acid transporter 1 (LAT1, SLC7A5), a transporter for amino acids such as L-leucine and L-phenylalanine.[11][96][101] Very few (less than 10 drugs) are known to be transported by this transporter.[102] Gabapentin is transported solely by the LAT1,[101][103] and the LAT1 is easily saturable, so the pharmacokinetics of gabapentin are dose-dependent, with diminished bioavailability and delayed peak levels at higher doses.[11] Gabapentin enacarbil is transported not by the LAT1 but by the monocarboxylate transporter 1 (MCT1) and the sodium-dependent multivitamin transporter (SMVT), and no saturation of bioavailability has been observed with the drug up to a dose of 2,800 mg.[104]

The oral bioavailability of gabapentin is approximately 80% at 100 mg administered three times daily once every 8 hours, but decreases to 60% at 300 mg, 47% at 400 mg, 34% at 800 mg, 33% at 1,200 mg, and 27% at 1,600 mg, all with the same dosing schedule.[103][104] Food increases the area-under-curve levels of gabapentin by about 10%.[103] Drugs that increase the transit time of gabapentin in the small intestine can increase its oral bioavailability; when gabapentin was co-administered with oral morphine (which slows intestinal peristalsis),[105] the oral bioavailability of a 600 mg dose of gabapentin increased by 50%.[103] The oral bioavailability of gabapentin enacarbil (as gabapentin) is greater than or equal to 68%, across all doses assessed (up to 2,800 mg), with a mean of approximately 75%.[104][11]

Gabapentin at a low dose of 100 mg has a Tmax (time to peak levels) of approximately 1.7 hours, while the Tmax increases to 3 to 4 hours at higher doses.[11] Food does not significantly affect the Tmax of gabapentin and increases the Cmax of gabapentin by approximately 10%.[103] The Tmax of the instant-release (IR) formulation of gabapentin enacarbil (as active gabapentin) is about 2.1 to 2.6 hours across all doses (350–2,800 mg) with single administration and 1.6 to 1.9 hours across all doses (350–2,100 mg) with repeated administration.[106] Conversely, the Tmax of the extended-release (XR) formulation of gabapentin enacarbil is about 5.1 hours at a single dose of 1,200 mg in a fasted state and 8.4 hours at a single dose of 1,200 mg in a fed state.[106]


Gabapentin can cross the blood–brain barrier and enter the central nervous system.[96] However, due to its low lipophilicity,[103] gabapentin requires active transport across the blood–brain barrier.[101][96][107][108] The LAT1 is highly expressed at the blood–brain barrier[109] and transports gabapentin across into the brain.[101][96][107][108] As with intestinal absorption of gabapentin mediated by LAT1, transportation of gabapentin across the blood–brain barrier by LAT1 is saturable.[101] It does not bind to other drug transporters such as P-glycoprotein (ABCB1) or OCTN2 (SLC22A5).[101] Gabapentin is not significantly bound to plasma proteins (<1%).[103]


Gabapentin undergoes little or no metabolism.[11][103] Conversely, gabapentin enacarbil, which acts as a prodrug of gabapentin, must undergo enzymatic hydrolysis to become active.[11][104] This is done via non-specific esterases in the intestines and to a lesser extent in the liver.[11]


Gabapentin is eliminated renally in the urine.[103] It has a relatively short elimination half-life, with a reported value of 5.0 to 7.0 hours.[103] Similarly, the terminal half-life of gabapentin enacarbil IR (as active gabapentin) is short at approximately 4.5 to 6.5 hours.[106] The elimination half-life of gabapentin has been found to be extended with increasing doses; in one series of studies, it was 5.4 hours for 200 mg, 6.7 hours for 400 mg, 7.3 hours for 800 mg, 9.3 hours for 1,200 mg, and 8.3 hours for 1,400 mg, all given in single doses.[106] Because of its short elimination half-life, gabapentin must be administered 3 to 4 times per day to maintain therapeutic levels.[104] Conversely, gabapentin enacarbil is taken twice a day and gabapentin XR (brand name Gralise) is taken once a day.[110]


Chemical structures of GABA, gabapentin, and two other gabapentinoids, pregabalin and phenibut.

Gabapentin was designed by researchers at Parke-Davis to be an analogue of the neurotransmitter GABA that could more easily cross the blood–brain barrier.[12] It is a 3-substituted derivative of GABA; hence, it is a GABA analogue, as well as a γ-amino acid.[111][97] Specifically, gabapentin is a derivative of GABA with a cyclohexane ring at the 3 position (or, somewhat inappropriately named, 3-cyclohexyl-GABA).[112][113][114] Gabapentin also closely resembles the α-amino acids L-leucine and L-isoleucine, and this may be of greater relevance in relation to its pharmacodynamics than its structural similarity to GABA.[99][100][112] In accordance, the amine and carboxylic acid groups are not in the same orientation as they are in the GABA,[12] and they are more conformationally constrained.[115]


A chemical synthesis of gabapentin has been described.[116]


Gabapentin was developed at Parke-Davis and was first described in 1975.[12][117] Under the brand name Neurontin, it was first approved in May 1993, for the treatment of epilepsy in the United Kingdom, and was marketed in the United States in 1994.[118][119] Subsequently, gabapentin was approved in the United States for the treatment of postherpetic neuralgia in May 2002.[120] A generic version of gabapentin first became available in the United States in 2004.[121] An extended-release formulation of gabapentin for once-daily administration, under the brand name Gralise, was approved in the United States for the treatment postherpetic neuralgia in January 2011.[122][123] Gabapentin enacarbil was introduced in the United States for the treatment of restless legs syndrome in 2011, and was approved for the treatment of postherpetic neuralgia in 2012.[124]

Society and culture


The wholesale price in the developing world as of 2015 was about US$10.80 per month;[16] in the United States, it was US$100 to US$200.[17] In 2017, it was the eleventh most commonly prescribed medication in the United States, with more than 46 million prescriptions.[18][19]


Gabapentin is best known under the brand name Neurontin manufactured by Pfizer subsidiary Parke-Davis.[citation needed] A Pfizer subsidiary named Greenstone markets generic gabapentin.[citation needed]

In December 2004, the FDA granted final approval to a generic equivalent to Neurontin made by the Israeli firm Teva Pharmaceutical Industries (Teva).[citation needed]

Neurontin began as one of Pfizer's best selling drugs; however, Pfizer was criticized and under litigation for its marketing of the drug (see Franklin v. Parke-Davis). Pfizer faced allegations that Parke-Davis marketed the drug for at least a dozen off-label uses that the FDA had not approved.[20][125] It has been used as a mainstay drug for migraines, even though it was not approved for such use in 2004.[126]

FDA approval

Gabapentin was originally approved by the U.S. Food and Drug Administration (FDA) in December 1993, for use as an adjuvant (effective when added to other antiseizure drugs) medication to control partial seizures in adults; that indication was extended to children in 2000.[127][15] In 2004, its use for treating postherpetic neuralgia (neuropathic pain following shingles) was approved.[127][128]

Off-label promotion

Although some small, non-controlled studies in the 1990s—mostly sponsored by gabapentin's manufacturer—suggested that treatment for bipolar disorder with gabapentin may be promising,[32] the preponderance of evidence suggests that it is not effective.[129] Subsequent to the corporate acquisition of the original patent holder, the pharmaceutical company Pfizer admitted that there had been violations of FDA guidelines regarding the promotion of unproven off-label uses for gabapentin in the Franklin v. Parke-Davis case.

Reuters reported on 25 March 2010, that "Pfizer Inc violated federal racketeering law by improperly promoting the epilepsy drug Neurontin ... Under federal RICO law the penalty is automatically tripled, so the finding will cost Pfizer $141 million."[130] The case stems from a claim from Kaiser Foundation Health Plan Inc. that "it was misled into believing Neurontin was effective for off-label treatment of migraines, bipolar disorder and other conditions. Pfizer argued that Kaiser physicians still recommend the drug for those uses."[131]

Bloomberg News reported "during the trial, Pfizer argued that Kaiser doctors continued to prescribe the drug even after the health insurer sued Pfizer in 2005. The insurer's website also still lists Neurontin as a drug for neuropathic pain, Pfizer lawyers said in closing argument."[132]

The Wall Street Journal noted that Pfizer spokesman Christopher Loder said, "We are disappointed with the verdict and will pursue post-trial motions and an appeal."[133] He later added that "the verdict and the judge's rulings are not consistent with the facts and the law."[130]

Franklin v. Parke-Davis case

According to the San Francisco Chronicle, off-label prescriptions accounted for roughly 90 percent of Neurontin sales.[134]

While off-label prescriptions are common for a number of drugs, marketing of off-label uses of a drug is not.[20] In 2004, Warner-Lambert (which subsequently was acquired by Pfizer) agreed to plead guilty for activities of its Parke-Davis subsidiary, and to pay $430 million in fines to settle civil and criminal charges regarding the marketing of Neurontin for off-label purposes. The 2004 settlement was one of the largest in U.S. history, and the first off-label promotion case brought successfully under the False Claims Act.

Brand names

A capsule of gabapentin

Gabapentin was originally marketed under the brand name Neurontin. Since it became generic, it has been marketed worldwide using over 300 different brand names.[1] An extended-release formulation of gabapentin for once-daily administration was introduced in 2011 for postherpetic neuralgia under the brand name Gralise.[135]

Related drugs

Parke-Davis developed a drug called pregabalin as a successor to gabapentin.[136] Pregabalin was brought to market by Pfizer as Lyrica after the company acquired Warner-Lambert. Pregabalin is related in structure to gabapentin.[137] Another new drug atagabalin has been trialed by Pfizer as a treatment for insomnia.[138]

A prodrug form (gabapentin enacarbil)[139] was approved by the U.S. Food and Drug Administration (FDA) in 2011 under the brand name Horizant for the treatment of moderate-to-severe restless legs syndrome (RLS)[140] and in 2012 for postherpetic neuralgia in adults.[141] In Canada, it has completed Phase 3 trials for RLS (September 2019).[142] It was designed for increased oral bioavailability over gabapentin.[143][144]

Recreational use

Also known on the streets as "Gabbies",[145] gabapentin is increasingly being abused and misused for its euphoric effects.[146][147] Furthermore, its misuse predominantly coincides with the usage of other illicit drugs, namely opioids, benzodiazepines, and alcohol.[24]

After Kentucky's implementation of stricter legislation regarding opioid prescriptions in 2012, there was an increase in gabapentin-only and multi-drug use in 2012–2015. The majority of these cases were from overdose in suspected suicide attempts. These rates were also accompanied by increases in abuse and recreational use.[148]

Gabapentin misuse, toxicity, and use in suicide attempts among adults in the US increased from 2013 to 2017.[149]

Veterinary use

In cats, gabapentin can be used as an analgesic in multi-modal pain management.[150] It is also used as an anxiety medication to reduce stress in cats for travel or vet visits.[151]

Gabapentin is also used in dogs and other animals, but some formulations (especially liquid forms) meant for human use contain the sweetener xylitol, which is toxic to dogs.[152]


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