AzTrials
AzTrials

Anxiety DisordersPhase 1NCT06065735

Concentration-QT Study of Paroxetine in Healthy Adults

A Phase 1 study testing Paroxetine in people with Anxiety Disorders, run by GlaxoSmithKline at 1 site in United Kingdom.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
Search all trials

Trial summary

The primary purpose of the study is to evaluate the potential effect of paroxetine on QTc interval following escalating doses in healthy participants. Participants with no history of cardiac abnormalities or mood disorders will be enrolled. Read more about this study

Who is it for?
Ages 18 to 65 yearsHealthy volunteers can take part
Conditions the study is for
Anxiety Disorders
What is being tested?
Paroxetine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
38 participants
Where
1 siteUnited Kingdom
Study dates
2 Oct 2023to 8 Jan 2024
Phase
Phase 1
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 65 years
  • All sexes
  • Healthy volunteers accepted
  • Adult, Older adult

Who may be able to join

  • Participants, both male and female, aged between 18 to 65 years, at the time of signing the informed consent.
  • Participants determined as healthy based on medical evaluation by an experienced physician.
  • A female participant is eligible to participate if she is of:
  • Nonchildbearing potential defined as premenopausal females with a documented tubal ligation or hysterectomy; or postmenopausal defined as 12 months of spontaneous amenorrhea.
  • Child-bearing potential and agrees to use one of the contraception methods for an appropriate time as mentioned in the study protocol.
  • Aspartate aminotransferase (AST), Alanine aminotransferase (ALT), alkaline phosphatase, and bilirubin ≤ 1.5x (Upper Limit of Normal) ULN (isolated bilirubin >1.5xULN is acceptable if bilirubin is fractionated and direct bilirubin <35%).
Show all 16Show fewer
  • Body weight ≥ 45 kilogram (kg) and Body Mass Index (BMI) within the range 18 to 29.5 kilogram per metre square (kg/m2) (inclusive).
  • No significant abnormality on 12-lead Electrocardiogram (ECG) at Screening in supine position, including the following specific requirements:
  • Heart rate ≥ 40 beats per minute
  • PR interval ≤ 220 milliseconds (msec) (For PR, QRS and QTcF interval, and Q wave, the mean of triplicate ECGs will be used)
  • Q waves < 50 msec (For PR, QRS and QTcF interval, and Q wave, the mean of triplicate ECGs will be used)
  • QRS interval to be ≥ 60msec and < 120msec (For PR, QRS and QTcF interval, and Q wave, the mean of triplicate ECGs will be used)
  • The waveforms must enable the QT interval to be clearly defined
  • QTcF interval must be < 450msec (machine or manual reading).
  • A signed and dated written informed consent obtained from participants capable of giving written informed consent, which includes compliance with the requirements and restrictions listed in the consent form.
  • Non-smokers (never smoked or not smoking for >6 months with <10 pack years history (Pack years = (cigarettes per day smoked/20) x number of years smoked) or light smokers (less than 5 cigarettes per day).

Who cannot join

  • History or presence of any medically significant disease that may cause additional risk or interfere with the study procedures or outcome.
  • History of symptomatic arrhythmias.
  • History of hypersensitivity to paroxetine and excipients
  • History of abnormal coagulation parameters, bleeding disorders or conditions which may predispose to bleeding.
  • History of, or active suicidal ideation. Includes assessment using the Columbia Suicide Severity Rating Scale (C-SSRS)
  • Must not have a pre-diagnosed mood disorder
Show all 25Show fewer
  • Participant is mentally or legally incapacitated.
  • A supine blood pressure that is persistently higher than 140/90 millimetres of mercury (mmHG) at Screening.
  • A supine heart rate outside the range 50-90 beats per minute (bpm) at Screening.
  • A positive screening Hepatitis B surface antigen or positive Hepatitis C antibody result within 3 months of screening.
  • Current or chronic history of liver disease or known hepatic or biliary abnormalities (except for Gilbert's syndrome or asymptomatic gallstones).
  • A positive drug/alcohol screen at screening or prior to dosing.
  • A positive test for Human Immune Virus (HIV) antibody at Screening.
  • History of regular alcohol consumption within 6 months of the study defined as: an average weekly intake of >21 units for males or >14 units for females. One unit is equivalent to 8 g of alcohol: a half-pint (~240 millilitre [ml]) of beer, 1 glass (125ml) of wine or 1 (25 ml) measure of spirits.
  • The participant has participated in a clinical trial and has received an investigational product within the following time prior to the first dosing day in the current study: 3 months, 5 half-lives or twice the duration of the biological effect of the investigational product (whichever is longer).
  • Exposure to more than four new chemical entities within 12 months prior to the first dosing day.
  • Use of the following medications within 7 days (or 14 days if the drug is a potential enzyme inducer) or 5 half-lives (whichever is longer) prior to the first dose of the study medication: monoamine oxidase inhibitors (including linezolid), thioridazine, pimozide, serotonergic drugs (including L-tryptophan, triptans, tramadol, selective serotonin reuptake inhibitors, lithium and fentanyl, tamoxifen, anti-coagulants, clozapine, phenothiazines, tricyclic antidepressants, acetylsalicylic acid, non-steroidal anti-inflammatory drugs, Cox-2 inhibitors, antiarrhythmics, quinolone antibiotics, macrolides (including clarithromycin and erythromycin), ketoconazole and itraconazole
  • Use of non-prescription drugs, including vitamins, herbal and dietary supplements (including St John's Wort) within 7 days (or 14 days if the drug is a potential enzyme inducer) or 5 half-lives (whichever is longer) prior to the first dose of study medication.
  • No current use of any medication other than paracetamol (doses ≤2 grams/day).
  • Consumption of Seville oranges, pummelos (members of the grapefruit family) or grapefruit juice from 7 days prior to the first dose of study medication.
  • Where participation in the study would result in donation of blood or blood products more than 500 mL within a 3-month period.
  • Pregnant females as determined by positive serum β-HCG test at screening or serum/ urine beta-Human chorionic gonadotropin (HCG) prior to dosing.
  • Lactating females.
  • Unwillingness or inability to follow the procedures outlined in the protocol.
  • Participants with unsuitable veins for cannulation and repeat venepuncture.

Trial locations and contacts

1 site in 1 country.

United Kingdom1 site
  • GSK Investigational Site

    London, HA1 3UJ

Other trials in United Kingdom

About this study

Official title: An Open-Label, Single Arm, Dose Escalating Concentration-QT Study to Investigate the Cardiac Effects and Safety of Paroxetine in Healthy Adult Participants

The primary purpose of the study is to evaluate the potential effect of paroxetine on QTc interval following escalating doses in healthy participants. Participants with no history of cardiac abnormalities or mood disorders will be enrolled. During the study, participants will take paroxetine at three incremental dose levels. Participants will attend the clinic at screening, baseline, at the end of each dose level administration week, and a final study exit visit. While on treatment outside of clinic visits, participants will be followed-up via video-call. A concentration-QTc analysis will assess any potential correlation between paroxetine plasma concentration and QTc prolongation. In addition, the occurrence of any side-effects will be compared between on and off treatment.

Being tested
Paroxetine
Keywords
Dose escalation, QTc Interval, Paroxetine, Healthy Adults
Medical subject headings
Anxiety Disorders

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • ParoxetineDrug

    Paroxetine will be administered

Study groups in NCT06065735
Study groupRoleWhat they receive
ParoxetineExperimentalNot described
Receives: Drug: Paroxetine

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Change From Baseline in Corrected QT Interval by Fridericia (QTcF Interval)

    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.

    Measured: 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

Secondary outcomes (7)
  1. Change From Baseline in Vital Signs: Systolic Blood Pressure (SBP) and Diastolic Blood Pressure (DBP)

    SBP and DBP were measured in the supine position using a semi-automatic blood pressure recording device with an appropriate cuff size after at least 5 minutes of rest. Baseline was defined as the sample obtained on Day -1. Change from Baseline was calculated by subtracting Baseline value from post dose value. Mean and standard deviation (SD) values of vital sign assessments at Day 48 are reported.

    Measured: Baseline (Day -1) and Day 48

  2. Change From Baseline in Vital Sign: Pulse Rate

    Pulse rate was measured in the supine position using a semi-automatic recording device with an appropriate cuff size after at least 5 minutes of rest. Baseline was defined as the sample obtained on Day -1. Change from Baseline was calculated by subtracting Baseline value from post dose value. Mean and SD values of vital sign assessments at Day 48 are reported.

    Measured: Baseline (Day -1) and Day 48

  3. Change From Baseline in Vital Sign: Body Temperature

    Body temperature measurements were performed in participants. Baseline was defined as the sample obtained on Day -1. Change from Baseline was calculated by subtracting Baseline value from post dose value. Mean and SD values of vital sign assessments at Day 48 are reported.

    Measured: Baseline (Day -1) and Day 48

  4. Number of Participants With Adverse Events (AEs) and Serious Adverse Events (SAEs)

    An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of a study intervention, whether or not considered related to the study intervention. An SAE is defined as any untoward medical occurrence that, at any dose, results in death; was life threatening; required hospitalization or prolongation of existing hospitalization; resulted in persistent or significant disability/incapacity; was a congenital anomaly/birth defect or any other situation as determined per medical and scientific judgment.

    Measured: Up to Day 48

  5. Number of Participants With Clinically Significant Findings for Hematology, Clinical Chemistry and Coagulation Laboratory Parameters

    The laboratory measurements included hematology, clinical chemistry and coagulation parameters. The parameters evaluated were Basophil, Eosinophil, Erythrocyte Mean Corpuscular Volume, Erythrocytes, Hematocrit, Hemoglobin, Lymphocyte, Monocyte, Neutrophils, Platelets, Reticulocytes, Alanine Aminotransferase, Alkaline phosphatase, Aspartate Aminotransferase, Bilirubin, Calcium, Creatinine, Direct Bilirubin, Potassium, Sodium, Creatinine kinase, Prothrombin time (PT), activated partial thromboplastin time (aPTT), international normalized ration (INR). Clinical significance was determined by the investigator. Number of participants with clinically significant findings in hematology, clinical chemistry and coagulation were reported.

    Measured: Up to Day 48

  6. Number of Participants With Clinically Significant Findings for Vital Signs

    Vital signs included systolic and diastolic blood pressure, pulse rate and body temperature. Blood pressure and pulse rate were measured with the participant in supine position after at least 5 minutes rest. Clinical significance was determined by the investigator. Number of participants with clinically significant findings in vital signs were reported.

    Measured: Up to Day 48

  7. Number of Participants With Clinically Significant Findings for Physical Examinations

    Physical examinations included assessment of skin, lungs, cardiovascular system, and abdomen (liver and spleen). Clinical significance was determined by the investigator. Number of Participants with clinically significant findings for physical examinations were reported.

    Measured: Up to Day 48

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted4 Oct 2023
  2. Study start2 Oct 2023
  3. Primary completion8 Jan 2024
  4. Study completion8 Jan 2024

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Other
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
38 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06065735
Sponsor's protocol ID
219882
Status last verified
Jul 2026
First submitted
26 Sep 2023
Last updated
19 Aug 2026
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: Study Sponsor will assess requests from qualified researchers for anonymized individual patient-level data and related study documents. Data sharing is subject to certain criteria, conditions, and exceptions. For further information, refer to https://www.gsk-studyregister.com/gsk-patient-level-data-sharing-july2025.pdf

Publications

  • van Dijkman SC, Felices M, Pandurangavittal B, Ghorpade S, Easterbrook C, Zabielski M, Della Pasqua O. An open-label, single-arm, dose-escalating concentration-QT study to investigate the cardiac effects and safety of paroxetine in healthy adults. Br J Clin Pharmacol. 2026 May;92(5):1385-1396. doi: 10.1002/bcp.70398. Epub 2026 Jan 14.

    PubMed 41535245

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing Paroxetine in people with Anxiety Disorders, run by GlaxoSmithKline at 1 site in United Kingdom.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 16 inclusion and 25 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 19 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 16 Dec 2024). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Change From Baseline in Corrected QT Interval by Fridericia (QTcF Interval) (time frame: 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). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT06065735, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 19 Aug 2026.

Free account

Log in to keep searching

You’ve used your 3 free searches. AzTrials is free: log in or create a free account to keep searching clinical trials and save the ones you want to follow.

Create a free accountLog in