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Paroxetine

Phase 3

Depressive Disorder, Major | Small molecule | Psychiatry |GSK plc|Last Updated: Aug 19, 2026

Target and mechanism

ModalitySmall molecule

Also known as Paroxetine hydrochloride, Paroxetine CR and Paroxetine IR, Paroxetine and Paroxetine IR, Paroxetine CR, Paroxetine CR 12.5mg tablet

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindUNCONTROLLED
Total Trials2
Total Enrollment922

FDA Designations

No designations recorded

Clinical trial landscape

Paroxetine · 8 trials · 7 indications

Phase 3 3Phase 2 2Phase 1 3
NCT00368303A Local Register Study For Major Depression Of Paroxetine Controlled ReleaseDepressive Disorder, Major
COMPLETED362 Analytics
NCT00067444Depression Study In Elderly PatientsDepressive Disorder, Major
COMPLETED560 Analytics
NCT00839397BRL29060A (Paroxetine Hydrochloride Hydrate) in Posttraumatic Stress DisorderPost-Traumatic Stress Disorder
COMPLETED52 Analytics
PHASE3COMPLETED
A Local Register Study For Major Depression Of Paroxetine Controlled Release
Depressive Disorder, MajorUnlock trial analytics
PHASE3COMPLETED
Depression Study In Elderly Patients
Depressive Disorder, MajorUnlock trial analytics
PHASE3COMPLETED
BRL29060A (Paroxetine Hydrochloride Hydrate) in Posttraumatic Stress Disorder
Post-Traumatic Stress DisorderUnlock trial analytics

Study Endpoints

Primary Endpoints

Scores on depression rating scale at treatment week 1,2,3,4,6 and 8.
Change from baseline to the week 10 last observation carried forward endpoint in the 17-item HAM-D total score.
10 Weeks
Change from baseline in the Clinician-Administered Posttraumatic Stress Disorder Scale One Week Symptom Status Version (CAPS-SX) total score
52 weeks
The primary outcome measure will be the change from baseline in the Liebowitz Social Anxiety Scale (LSAS)
Mean change from baseline in the Hamilton Anxiety Scale (HAM-A) total score (at Week 8, last observation carried forward [LOCF])
8 Weeks
Change From Baseline in Corrected QT Interval by Fridericia (QTcF Interval)
Baseline (Day -1); 0.25 Hours Pre-dose on Day 1; 1, 2, 3, 4, 4.5, 5, 5.5, 6, 8, 10, 12 Hours Post-dose on Day 1

A standard 12-lead electrocardiogram (ECG) were recorded in a participant using an ECG machine after 10 minutes rest in the supine position. Baseline was defined as the sample obtained on Day -1. Change from Baseline was calculated by subtracting Baseline value from post dose value.

Maximum Observed Plasma Concentration (Cmax) of Paroxetine
Pre-dose (0 hour) and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, 10, 12, 16, 24, 36, 48 and 72 hours post-dose

Blood samples were collected at indicated time points for the analysis of Cmax of Paroxetine. PK parameters were analyzed using non-compartmental analysis.

Area Under the Concentration-time Curve (AUC) From Time Zero to the Last Measurable Concentration (AUC[0-t]) of Paroxetine
Pre-dose (0 hour) and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, 10, 12, 16, 24, 36, 48 and 72 hours post-dose

Blood samples were collected at indicated time points for the analysis of AUC(0-t) of Paroxetine. PK parameters were analyzed using non-compartmental analysis.

Area Under the Concentration Versus Time Curve From Time Zero to Infinity (AUC[0-inf]) of Paroxetine
Pre-dose (0 hour) and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, 10, 12, 16, 24, 36, 48 and 72 hours post-dose

Blood samples were collected at indicated time points for the analysis of AUC(0-inf) of Paroxetine. PK parameters were analyzed using non-compartmental analysis.

Percentage of AUC (0 to Infinity) Obtained by Extrapolation (%AUCex) of Paroxetine
Pre-dose (0 hour) and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, 10, 12, 16, 24, 36, 48 and 72 hours post-dose

Blood samples were collected at indicated time points for the analysis of %AUCex of Paroxetine. PK parameters were analyzed using non-compartmental analysis.

Time of the Maximum Measured Plasma Concentration (Tmax) of Paroxetine
Pre-dose (0 hour) and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, 10, 12, 16, 24, 36, 48 and 72 hours post-dose

Blood samples were collected at indicated time points for the analysis of Tmax of Paroxetine. PK parameters were analyzed using non-compartmental analysis.

Elimination Half-life (t1/2) of Paroxetine
Pre-dose (0 hour) and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, 10, 12, 16, 24, 36, 48 and 72 hours post-dose

Blood samples were collected at indicated time points for the analysis of t1/2 of Paroxetine. PK parameters were analyzed using non-compartmental analysis.

Terminal Elimination Rate Constant (Kel) of Paroxetine
Pre-dose (0 hour) and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 8, 9, 10, 12, 16, 24, 36, 48 and 72 hours post-dose

Blood samples were collected at indicated time points for the analysis of Kel of Paroxetine. PK parameters were analyzed using non-compartmental analysis.

Pharmacokinetic parameters of plasma paroxetine after 14-days repeat dosing of paroxetine CR at 25mg/day or paroxetine IR at 20mg/day
up to 96 hours after dosing on Day 14 of each treatment period of paroxetine CR or paroxetine IR

Secondary Endpoints

Scores on clinical impression severity and improvement items at treatment week 1, 2,3,4,6,8
Mean change from baseline in HAM-D item 1; Mean change from baseline in the CGI severity of illness score at study endpoint; Percentage of patients with HAM-D total score less than or equal to 7.
10 Weeks
Proportion of responders based on the CGI Global Improvement
52 weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
ParoxetineOTHERA 52-week, non-comparative, uncontrolled study (However, the baseline phase is single blind)
PlaceboPLACEBO_COMPARATOR -
Paroxetine hydrochloride followed by PAXILEXPERIMENTAL -
PAXIL followed by paroxetine hydrochlorideEXPERIMENTAL -
Open label treatment with 2-period crossover designEXPERIMENTALGroup 1: Paroxetine CR 25 mg/day for 14 days / Paroxetine IR 20 mg/day for 14 days. Group 2: Paroxetine IR 20 mg/day for 14 days / Paroxetine CR 25 mg/day for 14 days., PK results will be compared between the Paroxetine CR treatment period and the Paroxetine IR treatment period.

Interventions

NameTypeDescription
Paroxetine CRDRUG -
Paroxetine IRDRUG -
ParoxetineDRUGSubjects will take the treatment phase medication once daily after an evening meal. All subjects will be maintained at Dose Level II (20 mg/day) for the first 2 weeks. If a sufficient clinical response ("1. Very much improved" or "2. Much improved" based on the CGI Global Improvement) is achieved, the subject will continue on the same dose level. When the clinical response is not sufficient but the investigational product is well tolerated, the dose will be increased to Dose Level III (30 mg/day) and then to Dose Level IV (40 mg/day) at intervals of at least 2 weeks until a sufficient response is reached. Once a sufficient response is obtained, the treatment will be continued at that dose. The treatment phase will last for a total of 52 weeks. In those patients receiving Dose Level III or IV, dosage reductions to the next lowest level (Dose Level II or III) consequent to an adverse event are permitted. Dosage adjustment will be made at the discretion of the PI or Sub-PI
PlaceboDRUGPlacebo
Paroxetine hydrochlorideDRUGParoxetine hydrochloride will be administered.
PAXIL (Paroxetine hydrochloride )DRUGPAXIL will be administered.
Paroxetine CR and Paroxetine IRDRUGRandomized, 2-period crossover repeat dosing of Paroxetine CR at 25 mg/day for 14 days and Paroxetine IR at 20 mg/day for 14 days in Japanese healthy male volunteers
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersNo
Study Sites11

Inclusion Criteria: * Patients with Major Depressive Disorder,score on depression rating scale reach a specific point(17 item Hamilton Depression Scale\>18). Exclusion criteria: * patients use monoamine oxidase inhibitors (MAOIs), benzodiazepines, Chinese herbal medicines, acupuncture, moxibustio...

Countries:ChinaUnited StatesArgentinaCanadaChileCosta RicaMexicoUnited KingdomJapan
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