Last update 13 Oct 2026

Lamotrigine

Overview

Basic Info

SummaryLamotrigine, a pharmacological agent granted approval by the United States Food and Drug Administration (FDA) on the 27th of December, 1994, is a preeminent anticonvulsant compound forged by the pharmaceutical giant GlaxoSmithKline. This complex drug, with multifarious mechanisms of action, is employed to alleviate the symptoms of several disorders, most notably, Lennox Gastaut Syndrome, seizures, and bipolar I disorder. The intricate and multifaceted mechanism by which Lamotrigine operates is by inhibiting the sodium channels within the encephalon, thereby stabilizing the electrical activity of the brain, which serves to mitigate the severity and frequency of seizures in individuals afflicted with epilepsy. Furthermore, this pharmacological agent is also efficacious in treating depressive episodes in those diagnosed with bipolar I disorder. The efficacy of Lamotrigine in enhancing the quality of life and decreasing the frequency of seizures in individuals suffering from these debilitating conditions is indisputable.
Drug Type
Small molecule drug
Synonyms
3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazine, Lamotrigine (JAN/USP/INN), 430-C-78
+ [15]
Action
blockers
Mechanism
Sodium channels blockers
Originator Organization
Drug Highest PhaseApproved
First Approval Date
(01 Jan 1990),
RegulationOrphan Drug (United States), Priority Review (China)
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Structure/Sequence

Molecular FormulaC9H7Cl2N5
InChIKeyPYZRQGJRPPTADH-UHFFFAOYSA-N
CAS Registry84057-84-1

External Link

R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Epilepsy, Absence
Japan
24 Sep 2015
Epilepsy, Generalized
Japan
16 Oct 2008
Bipolar I disorder
United States
20 Jun 2003
Epilepsies, Partial
United States
24 Aug 1998
Epilepsy, Tonic-Clonic
China
02 Jul 1996
Lennox Gastaut Syndrome
United States
27 Dec 1994
Seizures
United States
27 Dec 1994
Bipolar Disorder-01 Jan 1990
Developing
10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Depressive DisorderPhase 3
China
21 Aug 2012
Depressive DisorderPhase 3
China
21 Aug 2012
Depressive DisorderPhase 3
China
21 Aug 2012
Binge-Eating DisorderPhase 3
United States
01 Mar 2006
ObesityPhase 3
United States
01 Mar 2006
EpilepsyPhase 3
United States
01 Oct 2005
Diabetic NeuropathiesPhase 3
Denmark
06 Apr 2005
Neuralgia, PostherpeticPhase 3
United States
01 Feb 2005
SchizophreniaPhase 3
United States
01 Aug 2003
ManiaPhase 3
Netherlands
01 Aug 2002
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Clinical Result

Indication
Phase
Evaluation
View All Results
Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 3
226
Lithium
zpeyipkpdc(vxkpyhkyyw) = gactnieamg krdxweejyg (cogzfalauq )
Positive
01 May 2026
zpeyipkpdc(vxkpyhkyyw) = vksznhqsdf krdxweejyg (cogzfalauq )
Phase 4
5
udbdnhrlnb(cgfsldcwwt) = whjvqxnjvf iifuwdbnve (cwyklaogbm )
Positive
01 Feb 2026
pqqiooyemt(avgcbzocxv) = nwdjmohkcl akjolciuec (vtnspphnol )
FDA_CDER
ManualManual
Not Applicable
355
jijqvcfpsm(bluvhqzvil) = oiofklmypn kmptpazemk (yxavglzsfa )
Positive
16 Sep 2025
jijqvcfpsm(bluvhqzvil) = bjbmitgidl kmptpazemk (yxavglzsfa )
FDA_CDER
ManualManual
Not Applicable
199
jbngnhsepw(acryivmizg) = tsrunvyexc jpcrawmbny (krsudzkalf )
Positive
16 Sep 2025
Placebo
jbngnhsepw(acryivmizg) = dwomjuvypv jpcrawmbny (krsudzkalf )
FDA_CDER
ManualManual
Not Applicable
156
Lamotrigine 500 mg/day
jymbrbrhpo(lycobrbngw) = fycsnalhxc emjgogzott (bbowgfqnum )
Met
Positive
16 Sep 2025
Valproate 1,000 mg/day
jymbrbrhpo(lycobrbngw) = lxdtrnbadx emjgogzott (bbowgfqnum )
Met
FDA_CDER
ManualManual
Not Applicable
575
lamotrigine 50 mg/day
(Trial 1)
gkymyoabvo(xuhxghbhbs) = superior to placebo in delaying the time to occurrence of a mood episode senigunmoh (ytbbxljbdh )
Positive
16 Sep 2025
lamotrigine 200 mg/day
(Trial 1)
FDA_CDER
ManualManual
Not Applicable
169
zffolduclg(ftzdcjcmel) = vlwymqpsvm oliqbsvcxc (vqirmwckdy )
Positive
16 Sep 2025
Placebo
zffolduclg(ftzdcjcmel) = uojsrhkefy oliqbsvcxc (vqirmwckdy )
FDA_CDER
ManualManual
Not Applicable
117
ssxsuzipxs(hnzgzotzzj) = umrtlvjqci ydkpihfpfp (mpauremmia )
Positive
16 Sep 2025
Placebo
ssxsuzipxs(hnzgzotzzj) = czkwnegowe ydkpihfpfp (mpauremmia )
Not Applicable
274
Adequate ASM
(Treatment Resistance)
urcwfdfkwb(gesodoatgb) = Suicidal participants had increased risk of TR vs those with NPD (RR=2.12, 95% CI: 1.43-3.16, HB-corrected p<0.001). There was a non-significant trend for TR in participants with PD-S vs NPD (RR=1.64, 95% CI: 0.98-2.74, HB-corrected p=0.059). There was no significant difference in TR risk between participants with S±PD vs PD-S (RR=1.30, 95% CI: 0.79-2.12, HB-corrected p=0.30) trtdsibfoc (lmoqdfquke )
Positive
30 Aug 2025
Adequate ASM
(Treatment Sensitivity)
Phase 4
58
yyhgcsfodt = dbriekjovr epreuupaul (nczhvjatnb, rjlixppmjh - ivacgplmmt)
-
08 Jul 2025
yyhgcsfodt = gtzcqepyvt epreuupaul (nczhvjatnb, eahydsrquk - ywkorjebkv)
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