A Phase 1 interventional study of Oral VH4524184 and VH4524184 Formulation A SC in HIV Infections, sponsored by ViiV Healthcare. Recruiting at 5 sites in United States. Open to participants aged 18 Years to 55 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-11-05.
Sponsored by ViiV Healthcare (part of GlaxoSmithKline) · Phase 1, Interventional, and Treatment
The purpose of this study is to identify 1 or more doses of parenterally administered VH4524184 that are safe, well tolerated and yield a PK drug exposure profile necessary to deliver a long-acting antiretroviral therapy for the treatment of HIV-1 infection.
4,734 studies on the registry are indexed under HIV Infections; 244 are open to participants now.
This study's planned enrollment of 348 is above the median of 80 across 3,489 interventional studies indexed under HIV Infections.
Browse HIV Infections studies →ViiV Healthcare is the lead sponsor of 265 studies on the registry; 16 are open to participants now.
Of its 71 completed or terminated interventional studies of FDA-regulated products, 53 (75%) have results posted.
Counted across the registry records on this site, refreshed daily.
The criteria were revised on the registry on Nov 5, 2026. See what changed
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Age
-Participant must be 18 to 55 years of age inclusive, at the time of signing the .
Type of Participant and Characteristics
Weight -Body weight ≥50.0 kg (110 lbs) for men and ≥45.0 kg (99 lbs) for women and within the range 18.5 to 32.0 kg/m\^2 (inclusive) for all cohorts except B19. For Cohort B19, body mass index within the range >32.0 to 37.0 kg/m\^2 (inclusive).
Sex and /Barrier Requirements
Male or female
Participants of female sex assigned at birth:
Informed Consent
Exclusion Criteria:
Medical Conditions
Prior/Concomitant Therapy
Prior/Concurrent Clinical Study Experience
Diagnostic Assessments
Other Exclusions
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
The protein in red blood cells that carries oxygen. A low level is anaemia, which can cause tiredness and breathlessness. Measured in g/dL or g/L (9 g/dL is 90 g/L).
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
A recording of the heart’s electrical activity, taken with stickers on the chest, arms and legs. It takes a few minutes and does not hurt.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Metastases
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
QT and QTc
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Live vaccines
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
GFR and eGFR (kidney filtering)
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ULN (upper limit of normal)
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hemoglobin (Hb)
The protein in red blood cells that carries oxygen. A low level is anaemia, which can cause tiredness and breathlessness. Measured in g/dL or g/L (9 g/dL is 90 g/L).
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ALT and AST (liver enzymes)
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Bilirubin
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECG (electrocardiogram)
A recording of the heart’s electrical activity, taken with stickers on the chest, arms and legs. It takes a few minutes and does not hurt.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis C tests
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants receive a Formulation A starting dose of VH4524184 LAI subcutaneously (SC).
Drug: Oral VH4524184 · Drug: VH4524184 Formulation A SC · Drug: Placebo Formulation A SC · Drug: rHuPH20
Participants receive a Formulation B starting dose of VH4524184 LAI subcutaneously (SC).
Drug: Oral VH4524184 · Drug: rHuPH20 · Drug: VH4524184 Formulation B SC · Drug: Placebo Formulation B SC
Participants receive a Formulation A starting dose of VH4524184 LAI intramuscularly (IM).
Drug: Oral VH4524184 · Drug: VH4524184 Formulation A IM · Drug: Placebo Formulation A IM
Participants receive a Formulation B starting dose of VH4524184 LAI intramuscularly (IM).
Drug: Oral VH4524184 · Drug: VH4524184 Formulation B IM · Drug: Placebo Formulation B IM
VH4524184 LAI formulations administered SC or IM as single doses that achieve adequate PK exposure targets, may be evaluated for safety and tolerability as multiple doses.
Drug: Oral VH4524184 · Drug: VH4524184 Formulation A SC · Drug: Placebo Formulation A SC · Drug: rHuPH20 · Drug: VH4524184 Formulation B SC · Drug: Placebo Formulation B SC · Drug: VH4524184 Formulation A IM · Drug: Placebo Formulation A IM · Drug: VH4524184 Formulation B IM · Drug: Placebo Formulation B IM
VH4524184 to be taken orally.
VH4524184 LAI Formulation A administered subcutaneously.
Placebo Formulation A administered subcutaneously.
rHuPH20 administered subcutaneously.
Also known as: Halozyme ENHANZE
VH4524184 LAI Formulation B administered subcutaneously.
Placebo Formulation B administered subcutaneously.
VH4524184 LAI Formulation A administered intramuscularly.
Placebo Formulation A administered intramuscularly.
VH4524184 LAI Formulation B administered intramuscularly.
Placebo Formulation B administered intramuscularly.
Percentage of participants reporting adverse events (AEs) and related AEs
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. Related AE = AE assessed by the investigator as related to the study drug.
Time frame: From first study dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Percentage of participants with AEs by severity
Severity of AEs will be assessed using Division of AIDS Table for Grading the Severity of Adult Adverse Events (DAIDS). DAIDS grading scale is used to grade the toxicity associated with injection site reactions (ISR) including injection site pain (or tenderness), erythema (or redness), induration (or swelling), and pruritus. The toxicity level is graded from Grade 1 (lowest toxicity) to 4 (highest toxicity). Higher grade indicates higher toxicity.
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Percentage of participants discontinuing the treatment due to AEs
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Change from baseline in alanine aminotransferase (ALT), aspartate aminotransferase (AST) and alkaline phosphatase parameters
The liver panel laboratory parameters are assessed after the administration of long-acting injectable (LAI) VH4524184.
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Change from baseline in total bilirubin parameters
The liver panel laboratory parameters are assessed after the administration of LAI VH4524184.
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Change from baseline in international normalized ratio (INR) parameters
The liver panel laboratory parameters are assessed after the administration of LAI VH4524184.
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Maximum toxicity grade increase from baseline in ALT, AST and alkaline phosphatase
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Maximum toxicity grade increase from baseline in total bilirubin
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Maximum toxicity grade increase from baseline in INR
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Percentage of participants reporting injection site reaction (ISR) AEs
Grade 1 = mild, Grade 2 = moderate, Grade 3 = severe, and Grade 4 = potentially life threatening.
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Duration of injection site reaction AEs
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Area under the concentration-time curve from time zero (pre-dose) extrapolated to infinity time (AUC[0-inf]) of LAI VH4524184 following single dose administration
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Area under the plasma drug concentration-time curve from zero (pre-dose) to the end of the dosing interval at steady state (AUC[0-t]) of LAI VH4524184 following multiple dose administration
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Maximum observed plasma drug concentration (Cmax) of LAI VH4524184 following single dose administration
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Cmax of LAI VH4524184 following multiple dose administration
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Time to maximum observed plasma drug concentration (Tmax) of LAI VH4524184 following single dose administration
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Tmax of LAI VH4524184 following multiple dose administration
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Apparent terminal half-life (t1/2) of LAI VH4524184 following single dose administration
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
t1/2 of LAI VH4524184 following multiple dose administration
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Percentage of participants with treatment emergent Grade 3 or Grade 4 laboratory abnormalities
Grade 3 is defined as causing an inability to perform usual social \& functional activities with intervention or hospitalization indicated. Grade 4 is defined as an abnormality that is potentially life-threatening, causing an inability to perform basic self-care functions with intervention indicated to prevent permanent impairment, persistent disability, or death.
Time frame: From first dose administration (Day 1) up to Week 52 post last dose, and Week 80 post last dose for a sub-group of participants
Plan to share: 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.viiv-studyregister.com/documents/About_ViiV_Patient_Level_Data_Sharing_Final_28May2026.pdf
Supporting information: Study protocol, Statistical analysis plan, Informed consent form, Clinical study report
Time frame: Anonymized IPD will be made available within 6 months of publication of primary, key secondary and safety results for studies in product with approved indication(s) or asset(s) with development terminated across all indications.
Access criteria: Anonymized IPD is shared with researchers whose proposals are approved by an Independent Review Panel and after a Data Sharing Agreement is in place. Access is provided for an initial period of 12 months, but an extension may be granted, when justified, for up to 6 months.
Data sharing details ↗ · www.viiv-studyregister.com
No publications or documents are linked to this record.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
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Studies of the drug tested here: VH4524184