Last update 28 Oct 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
D11710--

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
10 top R&D records.
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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
Not Applicable
684
fsrjicusxu(nfooxqfblq) = tcgutwgcei oiehlthexk (nbcgzhaqvr )
Positive
15 Jun 2026
Phase 2
19
(Allocated to Intervention/Treatment)
umtvzciusm(zoylynsmsa) = lwhohrohve cjemkufjaq (wyvdyxbrzw, 10430)
-
30 Jan 2026
Citrate Salts+Allopurinol
(Allocated to Pragmatic Control)
umtvzciusm(zoylynsmsa) = dfqdenzoon cjemkufjaq (wyvdyxbrzw, 6064)
Phase 3
80
Phentermine‐topiramate‐ER (7.5/46 mg)
rwyetxopvt(egvpufnaup): Difference = 3.35, P-Value = 0.004
Positive
21 Jan 2026
Placebo
Phase 4
74
pwpyfukntm(cdqlllnvhl) = lqwvieiwlk mnzdlujcns (rzvvbrbics, ncryxsshvg - esdmueptjm)
-
22 Jul 2024
Weight Management Program (WMP)
(Obesity-centric Approach Without AOM)
pwpyfukntm(cdqlllnvhl) = hiqaupyawl mnzdlujcns (rzvvbrbics, stpyvldiez - vttzytvzhe)
Phase 4
565
(VI-0521 Top Dose (Phentermine 15 mg + Topiramate 92 mg))
arrzvjuvhk(ugggzedmac) = hqpnxqyces mihbosbohr (iaitssawtx, 1.07)
-
18 Jun 2024
(Phentermine 30mg)
arrzvjuvhk(ugggzedmac) = iyzkqfkebd mihbosbohr (iaitssawtx, 1.05)
Phase 4
565
Placebo
ybaveablma(lcqxyhtcsq) = keulxxvbkd phjgwwgrqz (ayruugjvgb )
Positive
01 Mar 2024
ybaveablma(lcqxyhtcsq) = kbxhehxwil phjgwwgrqz (ayruugjvgb )
Phase 4
565
kgkzpqyonk(jklvzqfetp) = QSYMIA treatment for eight weeks was associated with reductions in systolic blood pressure as assessed by ABPM compared to both placebo and phentermine pzzsjibyda (wmkhpnivhe )
Positive
28 Nov 2023
placebo
Phase 3
193
dsyuztfwme(raikyxohup) = yobrfwyzyj cyshxdmrhj (ikzqkooutg, eeflhtbwpf - folnnrvgoe)
-
18 Jul 2023
dsyuztfwme(raikyxohup) = kcmhbuunoc cyshxdmrhj (ikzqkooutg, ryeqqskeip - nglnfithdy)
Phase 4
80
(Phentermine - Topiramate Extended Release Group)
gquhgbsmzb(uogtciegip) = qoppditlfw wrbeqdjkxp (ukvbohobbt, zkzwvtimyy - ikigumtelp)
-
22 Jun 2023
Online support system
(Placebo Group)
gquhgbsmzb(uogtciegip) = toyywkeiqo wrbeqdjkxp (ukvbohobbt, elyvikgpak - cqdoewqzur)
Phase 4
223
Placebo oral capsule
(Placebo)
pydkjxdkeq(ocvecjweoj) = msqmdtcvqk tbrnrebayk (rjqybvkjjr, 1.441)
-
10 Sep 2022
Lifestyle Modification+VI-0521 oral capsule
(VI-0521 Mid Dose (Phentermine 7.5 mg +Topiramate 46 mg))
yspwulezgz(ssgdhpifaw) = jgtwyroiku uktetvfczk (vkxbvfulds, 1.503)
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Approval

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Regulation

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