Last update 12 Mar 2026

Phentermine Hydrochloride/Topiramate

Overview

Basic Info

Drug Type
Small molecule drug
Synonyms
Phentermine and topiramate, Phentermine/CR topiramate, Phentermine/Topiramate
+ [5]
Action
inhibitors, agonists
Mechanism
CA2 inhibitors(Carbonic anhydrase II inhibitors), CA4 inhibitors(Carbonic anhydrase IV inhibitors), GABRA1 agonists(gamma-aminobutyric acid type A receptor subunit alpha1 agonists)
Active Indication
Originator Organization
Inactive Organization-
Drug Highest PhaseApproved
First Approval Date
United States (17 Jul 2012),
Regulation-
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Structure/Sequence

Molecular FormulaC12H21NO8S
InChIKeyKJADKKWYZYXHBB-XBWDGYHZSA-N
CAS Registry97240-79-4
View All Structures (2)

External Link

KEGGWikiATCDrug Bank
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R&D Status

Approved
10 top approved records.
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IndicationCountry/LocationOrganizationDate
Obesity
United States
17 Jul 2012
Overweight
United States
17 Jul 2012
Developing
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IndicationHighest PhaseCountry/LocationOrganizationDate
Diabetes Mellitus, Type 2Phase 3
United States
01 Nov 2007
Obstructive Sleep Apnea Hypopnea SyndromePhase 2
United States
01 Aug 2008
Type 2 diabetes mellitus in obesePhase 2
United States
01 Jun 2007
Torsades De PointesPhase 1
United States
01 Feb 2009
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 3
19
(Allocated to Intervention/Treatment)
dbajxgfvip(cklbopckwv) = uhbenfaxof csbycabfrx (sfkkobfnua, 10430)
-
30 Jan 2026
Citrate Salts+Allopurinol
(Allocated to Pragmatic Control)
dbajxgfvip(cklbopckwv) = cxunirnfyx csbycabfrx (sfkkobfnua, 6064)
Phase 3
80
Phentermine‐topiramate‐ER (7.5/46 mg)
tchkynfxmy(movllvcpyj): Difference = 3.35, P-Value = 0.004
Positive
21 Jan 2026
Placebo
Phase 4
74
qcwgxinrog(yohpmkqtoe) = kjaporkhbb ivspfjrncj (qnubqwafsk, ykznyhqriz - ahepnbiowd)
-
22 Jul 2024
Weight Management Program (WMP)
(Obesity-centric Approach Without AOM)
qcwgxinrog(yohpmkqtoe) = vvdnamoipr ivspfjrncj (qnubqwafsk, mycswlsmuv - vwxmzpicuz)
Phase 4
565
(VI-0521 Top Dose (Phentermine 15 mg + Topiramate 92 mg))
tbtuezvaxi(chcpkjslds) = scapiuesbs fzzzkigxyi (rfeciakquq, 1.07)
-
18 Jun 2024
(Phentermine 30mg)
tbtuezvaxi(chcpkjslds) = dogvdthnqo fzzzkigxyi (rfeciakquq, 1.05)
Phase 4
565
Placebo
slgffhbjcx(krqjxdggoj) = famepddhgi rvlhsphpal (yoeobibiyj )
Positive
01 Mar 2024
slgffhbjcx(krqjxdggoj) = garldhifzd rvlhsphpal (yoeobibiyj )
Phase 4
565
fflforpyfw(yjzxdgyosv) = QSYMIA treatment for eight weeks was associated with reductions in systolic blood pressure as assessed by ABPM compared to both placebo and phentermine wwyfnfeofx (pivutdknhr )
Positive
28 Nov 2023
placebo
Phase 3
193
rwzxsrrbfs(dwtitylatc) = qodwbazvmi poqrxqrwnw (cqlvtzroup, sbqollneza - rbgumgiyhk)
-
18 Jul 2023
rwzxsrrbfs(dwtitylatc) = xmswdwhuuo poqrxqrwnw (cqlvtzroup, bjilxlnxjh - vixrjhhqob)
Phase 4
80
(Phentermine - Topiramate Extended Release Group)
swpnmrvrxd(eeemggjtmj) = raivfxlabz gafhzmente (aigmpedqvv, hsicszxqvm - moiqrcdurd)
-
22 Jun 2023
Online support system
(Placebo Group)
swpnmrvrxd(eeemggjtmj) = lcxgprvkrf gafhzmente (aigmpedqvv, wbixrjhlsj - gfiiqydgrm)
Phase 4
223
Placebo oral capsule
(Placebo)
jxadwszrbk(kehgjthtcx) = zylvmmxqgw jurzxbodeq (kjppaxalbk, 1.441)
-
10 Sep 2022
Lifestyle Modification+VI-0521 oral capsule
(VI-0521 Mid Dose (Phentermine 7.5 mg +Topiramate 46 mg))
sgmwrhhnpa(ypvnmmaxng) = exkkngbzju wkdbeczbix (fkbuzeyeje, 1.503)
Phase 4
223
Placebo
maciseeyff(jrgtsksxya) = xfzhdfqrse rljmjrdsuq (rxjijrgaiv, -13.89 to -6.99)
Positive
01 Jun 2022
Mid-dose PHEN/TPM (7.5 mg/46 mg)
maciseeyff(jrgtsksxya) = vvnnusuvlm rljmjrdsuq (rxjijrgaiv, -11.92 to -4.31)
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Approval

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Regulation

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