HealthyPhase 4NCT03123848

A Study to Evaluate the Pharmacokinetics (PK) of Darunavir (DRV) and Cobicistat (COBI) After a Single Oral Administration of Darunavir/Cobicistat Fixed-Dose Combination in Healthy Japanese Adult Participants

A Phase 4 study testing Darunavir/Cobicistat in people with Healthy, run by Janssen Pharmaceutical K.K. at 1 site in Japan.

Completed

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

Official record

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Trial summary

The purpose of the study is to evaluate the pharmacokinetic (PK) and safety of darunavir (DRV) and cobicistat (COBI) after a single oral administration of Prezcobix (DRV/COBI fixed-dose combination tablet) in healthy Japanese adult participants. Read more about this study

Who is it for?: Ages 20 to 55 yearsHealthy volunteers can take part
Conditions the study is for: Healthy
What is being tested?: Darunavir/Cobicistat
Type of treatment: Pill or oral medicine
Could I receive a placebo?: No, everyone receives an active treatment
How many people: 8 participants
Where: 1 siteJapan
Study dates: 14 Apr 2017to 19 May 2017
Phase: Phase 4
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 20 to 55 years
All sexes
Healthy volunteers accepted
Adult

Who may be able to join

Participants must be healthy on the basis of physical examination, medical history, vital signs, and 12-lead electrocardiogram (ECG) performed at screening. This determination must be recorded in the participants source documents and initialed by the investigator
A woman of childbearing potential must have a negative serum (beta-human chorionic gonadotropin [hCG]) at screening and urine pregnancy test at the time of admission to the study site, hospitalization, and must not breast feed from screening onwards
Contraceptive use by men or women should be consistent with local regulations regarding the use of contraceptive methods for participant participating in clinical studies
A woman must agree not to donate eggs (ova, oocytes) for the purposes of assisted reproduction during the study and for a period of at least 30 days after intake of the study drug
Nonsmoker or participant who habitually smokes no more than 10 cigarettes or equivalent of e-cigarettes, or 2 cigars, or 2 pipes of tobacco per day for at least 6 months before study drug administration

Who cannot join

Participant has a history of or current clinically significant medical illness including (but not limited to) cardiac arrhythmias or other cardiac disease, hematologic disease, coagulation disorders (including any abnormal bleeding or blood dyscrasias), lipid abnormalities, significant pulmonary disease, including bronchospastic respiratory disease, diabetes mellitus, liver or renal insufficiency (estimated creatinine clearance below 80 milliliter per minute [mL/min]); thyroid disease, neurologic or psychiatric disease, infection, significant cardiac, vascular, pulmonary, gastrointestinal, endocrine, neurologic, hematologic, rheumatologic, psychiatric, metabolic disturbances or any other illness that the investigator considers should exclude the participant or that could interfere with the interpretation of the study results
Participant has a history of malignancy before screening (exceptions are squamous and basal cell carcinomas of the skin and carcinoma in situ of the cervix, or malignancy, that is considered cured with minimal risk of recurrence)
Participant has a history of or current clinically significant skin reactions (such as but not limited to Stevens-Johnson Syndrome [SJS], Toxic Epidermal Necrolysis (TEN), and/or erythema multiforme) or any history of allergies to drugs, such as, but not limited to, sulfonamides and penicillins
Participant has been contraindicated DRV and COBI per local prescribing information
Participant is a woman, who is pregnant, or breast-feeding, or planning to become pregnant while enrolled in this study

Trial locations and contacts

1 site in 1 country.

Japan1 site

Souseikai Hakata Clinic
Fukuoka, 8120025

Other trials in Japan

About this study

Official title: An Open-label Study to Evaluate the Pharmacokinetics (PK) of Darunavir (DRV) and Cobicistat (COBI) After a Single-oral Administration of Darunavir/Cobicistat Fixed-Dose Combination Tablet in Healthy Japanese Adult Subjects

Conditions: Healthy
Being tested: Darunavir/Cobicistat

What participants receive

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

Darunavir/CobicistatDrug
Also called TMC114/JNJ-48763364-AAA
Participants will receive a FDC tablet of darunavir 800 mg and cobicistat 150 mg orally in the morning of Day 1.

Study groups in NCT03123848
Study group	Role	What they receive
Darunavir/Cobicistat FDC (Prezcobix)	Experimental	Participants will receive one darunavir/cobicistat fixed-dose combination (FDC) tablet, containing 800 milligram (mg) of darunavir (DRV) and 150 mg of cobicistat (COBI) in the morning on Day 1. Receives: Drug: Darunavir/Cobicistat

What is being measured

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

Maximum Observed Plasma Concentration (Cmax)
The Cmax is the maximum observed plasma concentration.
Measured: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Concentration at Last Quantifiable Time Point (Clast)
Clast is defined as concentration at last quantifiable time point.
Measured: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Time to Reach the Maximum Plasma Concentration (Tmax)
Tmax is defined as the time to reach the maximum plasma concentration.
Measured: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Area Under the Plasma Concentration-Time Curve From Time Zero to Time the Last Quantifiable Time (AUC[0-last])
AUC(0-last) is defined as area under the plasma concentration-time curve from time zero to time the last quantifiable time, calculated by linear trapezoidal summation.
Measured: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Area Under the Plasma Concentration-Time Curve From Time Zero to Infinite Time (AUC0-infinity)
AUC(0-infinity) is defined as area under the plasma concentration-time curve from time zero to infinite time.
Measured: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Elimination Rate Constant (Lambda[z])
Lambda(z) is first-order rate constant associated with the terminal portion of the curve, determined as the negative slope of the terminal log-linear phase of the drug concentration-time curve.
Measured: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Terminal Elimination Half-Life (t1/2)
t1/2 is the time measured for the plasma concentration to decrease by 1 half to its original concentration. It is associated with the terminal slope of the semi logarithmic drug concentration-time curve, and is calculated as 0.693/lambda(z).
Measured: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Apparent Volume of Distribution (Vz/F)
Vz/F is defined as the apparent volume of distribution at the terminal phase after extravascular administration.
Measured: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Apparent Total Body Clearance of Drug at the Terminal Phase After Extravascular Administration (CL/F)
CL/F is the apparent total body clearance of drug at the terminal phase after extravascular administration.
Measured: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose

Secondary outcomes (1)

Number of Participants With Adverse Events (AEs)
An AE is any untoward medical occurrence in a participant participating in a clinical study that does not necessarily have a causal relationship with the pharmaceutical/biological agent under study.
Measured: Up to approximately 1 month

Timeline

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

14 Apr 201719 May 2017

First posted21 Apr 2017
Study start14 Apr 2017
Primary completion19 May 2017
Study completion19 May 2017

Resources

Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
Other trials for HealthyStudies of the same condition, open and under way.
What the trial phases meanHow a treatment moves from first tests in people to approval.

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 4
Primary purpose: Other
Allocation: Not applicable
Intervention model: Single group
Masking: None (open label)
Enrolment: 8 participants (actual)

IDs, dates and publications

ClinicalTrials.gov ID: NCT03123848
Sponsor's protocol ID: CR108319
Other IDs: TMC114FD1HTX4002
Status last verified: Jan 2025
First submitted: 19 Apr 2017
Last updated: 4 Feb 2025
Results posted: Yes, on ClinicalTrials.gov
Data monitoring committee: No
FDA-regulated drug: Yes
FDA-regulated device: No

Want to know more?

The sponsor has not listed a contact. The official record may have more details.

Talk to your doctor first and take this page with you. Only the study team can confirm whether you can join.

Questions to ask the study team

What is the study trying to find out?
What would I need to do, and how often would I visit?
Could I receive a placebo instead of the treatment?
What are the possible risks and benefits for me?
Will it cost me anything? Are travel or time paid for?
Can I keep seeing my own doctor during the study?
What happens when the study ends?

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Study at a glance

From the registry record, last updated by the sponsor on 4 Feb 2025. Recruitment status is as the sponsor reported it: confirm with the study team.

Official title: An Open-label Study to Evaluate the Pharmacokinetics (PK) of Darunavir (DRV) and Cobicistat (COBI) After a Single-oral Administration of Darunavir/Cobicistat Fixed-Dose Combination Tablet in Healthy Japanese Adult Subjects
ClinicalTrials.gov ID: NCT03123848
Acronym / sponsor ID: CR108319
Conditions: Healthy
Phase: Phase 4
Study type: Interventional
Recruitment status: Completed
Enrolment: 8 participants (actual)
Lead sponsor: Janssen Pharmaceutical K.K.Industry (pharma, biotech, devices)
Study start: 14 Apr 2017 (actual)
Primary completion: 19 May 2017 (actual)
Study completion: 19 May 2017 (actual)
First posted: 21 Apr 2017 (actual)
Results: Posted 12 Jun 2018

Clinical summary

The research question as the sponsor registered it. This describes what the study plans to test, not what it found.

Study design

Primary purpose: Other
Allocation: Not applicable
Intervention model: Single group
Masking: None (open label)
Number of arms: 1

Arm	Type	Receives
Darunavir/Cobicistat FDC (Prezcobix)	Experimental	Drug: Darunavir/CobicistatParticipants will receive one darunavir/cobicistat fixed-dose combination (FDC) tablet, containing 800 milligram (mg) of darunavir (DRV) and 150 mg of cobicistat (COBI) in the morning on Day 1.

Who may qualify

Ages: 20 to 55 years
Sex: All
Healthy volunteers: Accepted
Age groups: Adult

Key inclusion criteria (5 listed)

Participants must be healthy on the basis of physical examination, medical history, vital signs, and 12-lead electrocardiogram (ECG) performed at screening. This determination must be recorded in the participants source documents and initialed by the investigator
A woman of childbearing potential must have a negative serum (beta-human chorionic gonadotropin [hCG]) at screening and urine pregnancy test at the time of admission to the study site, hospitalization, and must not breast feed from screening onwards
Contraceptive use by men or women should be consistent with local regulations regarding the use of contraceptive methods for participant participating in clinical studies
A woman must agree not to donate eggs (ova, oocytes) for the purposes of assisted reproduction during the study and for a period of at least 30 days after intake of the study drug
Nonsmoker or participant who habitually smokes no more than 10 cigarettes or equivalent of e-cigarettes, or 2 cigars, or 2 pipes of tobacco per day for at least 6 months before study drug administration

Key exclusion criteria (5 listed)

Participant has a history of or current clinically significant medical illness including (but not limited to) cardiac arrhythmias or other cardiac disease, hematologic disease, coagulation disorders (including any abnormal bleeding or blood dyscrasias), lipid abnormalities, significant pulmonary disease, including bronchospastic respiratory disease, diabetes mellitus, liver or renal insufficiency (estimated creatinine clearance below 80 milliliter per minute [mL/min]); thyroid disease, neurologic or psychiatric disease, infection, significant cardiac, vascular, pulmonary, gastrointestinal, endocrine, neurologic, hematologic, rheumatologic, psychiatric, metabolic disturbances or any other illness that the investigator considers should exclude the participant or that could interfere with the interpretation of the study results
Participant has a history of malignancy before screening (exceptions are squamous and basal cell carcinomas of the skin and carcinoma in situ of the cervix, or malignancy, that is considered cured with minimal risk of recurrence)
Participant has a history of or current clinically significant skin reactions (such as but not limited to Stevens-Johnson Syndrome [SJS], Toxic Epidermal Necrolysis (TEN), and/or erythema multiforme) or any history of allergies to drugs, such as, but not limited to, sulfonamides and penicillins
Participant has been contraindicated DRV and COBI per local prescribing information
Participant is a woman, who is pregnant, or breast-feeding, or planning to become pregnant while enrolled in this study

Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.

Interventions

Intervention	Type	Arms
Darunavir/CobicistatAlso: TMC114/JNJ-48763364-AAAParticipants will receive a FDC tablet of darunavir 800 mg and cobicistat 150 mg orally in the morning of Day 1.	Drug	Darunavir/Cobicistat FDC (Prezcobix)

Primary outcome

Maximum Observed Plasma Concentration (Cmax)
Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
The Cmax is the maximum observed plasma concentration.
Concentration at Last Quantifiable Time Point (Clast)
Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Clast is defined as concentration at last quantifiable time point.
Time to Reach the Maximum Plasma Concentration (Tmax)
Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Tmax is defined as the time to reach the maximum plasma concentration.
Area Under the Plasma Concentration-Time Curve From Time Zero to Time the Last Quantifiable Time (AUC[0-last])
Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
AUC(0-last) is defined as area under the plasma concentration-time curve from time zero to time the last quantifiable time, calculated by linear trapezoidal summation.
Area Under the Plasma Concentration-Time Curve From Time Zero to Infinite Time (AUC0-infinity)
Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
AUC(0-infinity) is defined as area under the plasma concentration-time curve from time zero to infinite time.
Elimination Rate Constant (Lambda[z])
Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Lambda(z) is first-order rate constant associated with the terminal portion of the curve, determined as the negative slope of the terminal log-linear phase of the drug concentration-time curve.
Terminal Elimination Half-Life (t1/2)
Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
t1/2 is the time measured for the plasma concentration to decrease by 1 half to its original concentration. It is associated with the terminal slope of the semi logarithmic drug concentration-time curve, and is calculated as 0.693/lambda(z).
Apparent Volume of Distribution (Vz/F)
Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
Vz/F is defined as the apparent volume of distribution at the terminal phase after extravascular administration.
Apparent Total Body Clearance of Drug at the Terminal Phase After Extravascular Administration (CL/F)
Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose
CL/F is the apparent total body clearance of drug at the terminal phase after extravascular administration.

1 secondary outcome

Number of Participants With Adverse Events (AEs)
Time frame: Up to approximately 1 month

Results and safety

Results posted to the registry on 12 Jun 2018, as reported by the sponsor. Figures are copied from the record, not re-analysed. Full results on ClinicalTrials.gov.

Participant flow

Group	Started	Completed
Darunavir 800 mg/Cobicistat 150 mg as FDC (Prezcobix)	8	8

Primary outcome: Maximum Observed Plasma Concentration (Cmax)

Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose. Mean (Standard Deviation). Unit: nanogram per milliliter (ng/mL)

Measure	Darunavir 800 mg (FDC: Darunavir 800/Cobicistat 150 mg) n = 8	Cobicistat 150 mg (FDC: Darunavir 800/Cobicistat 150 mg) n = 8
Value	5496 (952)	832 (265)

Population analysed: Pharmacokinetic (PK) analysis set included all participants who received the study drug and had at least one plasma concentration data-point after administration. Cmax for each analyte (Darunavir and Cobicistat) of fixed dose combination has been reported separately in each arm as per planned analysis.

Primary outcome: Concentration at Last Quantifiable Time Point (Clast)

Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose. Mean (Standard Deviation). Unit: ng/mL

Measure	Darunavir 800 mg (FDC: Darunavir 800/Cobicistat 150 mg) n = 8	Cobicistat 150 mg (FDC: Darunavir 800/Cobicistat 150 mg) n = 8
Value	33.3 (60.3)	8.59 (3.24)

Population analysed: PK analysis set included all participants who received the study drug and had at least one plasma concentration data-point after administration. Clast for each analyte (Darunavir and Cobicistat) of fixed dose combination has been reported separately in each arm as per planned analysis.

Primary outcome: Time to Reach the Maximum Plasma Concentration (Tmax)

Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose. Median (Full Range). Unit: hour (h)

Measure	Darunavir 800 mg (FDC: Darunavir 800/Cobicistat 150 mg) n = 8	Cobicistat 150 mg (FDC: Darunavir 800/Cobicistat 150 mg) n = 8
Value	4.00 (3.00 to 4.00)	4.00 (2.00 to 4.00)

Population analysed: PK analysis set included all participants who received the study drug and had at least one plasma concentration data-point after administration. Tmax for each analyte (Darunavir and Cobicistat) of fixed dose combination has been reported separately in each arm as per planned analysis.

Primary outcome: Area Under the Plasma Concentration-Time Curve From Time Zero to Time the Last Quantifiable Time (AUC[0-last])

Time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose. Mean (Standard Deviation). Unit: hour*nanogram per milliliter (h*ng/mL)

Measure	Darunavir 800 mg (FDC: Darunavir 800/Cobicistat 150 mg) n = 8	Cobicistat 150 mg (FDC: Darunavir 800/Cobicistat 150 mg) n = 8
Value	51274 (15983)	5667 (3119)

Population analysed: PK analysis set included all participants who received the study drug and had at least one plasma concentration data-point after administration time zero to time the last quantifiable time. AUC\[0-last\] for each analyte (Darunavir and Cobicistat) of fixed dose combination has been reported separately in each arm as per planned analysis.

1 secondary outcome is reported in the full results.

Adverse events

Time frame: Up to approximately 1 month. Other adverse events reported at 5% frequency or more

Group	Serious adverse events	Other adverse events	Deaths
Darunavir 800 mg/Cobicistat 150 mg as FDC (Prezcobix)	0 of 8 (0%)	0 of 8 (0%)	0 of 8

Loading the posted results from ClinicalTrials.gov…

Research links

Official record on ClinicalTrials.govLast updated by the sponsor 4 Feb 2025.
Posted resultsParticipant flow, baseline, all outcome measures and adverse events.

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Referral and contact

AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.

Janssen Pharmaceutical K.K., Japan Clinical Trial study director

Janssen Pharmaceutical K.K.

1 site in 1 country: see every site and its status.

Questions about this trial

What is this clinical trial studying?

A Phase 4 study testing Darunavir/Cobicistat in people with Healthy, run by Janssen Pharmaceutical K.K. at 1 site in Japan.

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 5 inclusion and 5 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 4 Feb 2025. 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 Japan. 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 4 studies take place after a treatment is approved, to learn more about its long-term benefits and risks in everyday use.

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 12 Jun 2018). 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?

Maximum Observed Plasma Concentration (Cmax) (time frame: Predose, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 9, 12, 16, 20, 24, 36, 48, 60, 72 hours postdose). The study lists 9 primary outcomes in all. 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 NCT03123848.

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 4 Feb 2025; AzTrials last refreshed its copy on 7 Nov 2026.