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Posaconazole/kg

Phase 2

Invasive Fungal Infection | Small molecule | Infectious Disease |Merck & Company, Inc.|Last Updated: Aug 12, 2026

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment40

FDA Designations

No designations recorded

Clinical trial landscape

Posaconazole/kg · 1 trial · 1 indication

Phase 2 1
NCT04665037Posaconazole (MK-5592) Intravenous and Oral in Children (<2 Years) With Invasive Fungal Infection (MK-5592-127)Invasive Fungal Infection
RECRUITING40 Analytics
PHASE2RECRUITING
Posaconazole (MK-5592) Intravenous and Oral in Children (<2 Years) With Invasive Fungal Infection (MK-5592-127)
Invasive Fungal InfectionUnlock trial analytics

Study Endpoints

Primary Endpoints

Average concentration (Cavg) of single-dose IV POS (Panel A)
Predose, 0.25 and 24 hours post-infusion on Day 1

The Cavg of IV POS is based on population PK analysis.

Maximum concentration (Cmax) of single-dose IV POS (Panel A)
Predose, 0.25 and 24 hours post-infusion on Day 1

The Cmax of IV POS is based on population PK analysis.

Time to maximum concentration (Tmax) of single-dose IV POS (Panel A)
Predose, 0.25 and 24 hours post-infusion on Day 1

The Tmax of IV POS is based on population PK analysis.

Area under the plasma concentration-time curve from dosing to 24 hours postdose (AUC0-24) of single-dose IV POS (Panel A)
Predose, 0.25 and 24 hours post-infusion on Day 1

The AUC 0-24 of IV POS is based on population PK analysis.

Clearance (CL) of single-dose IV POS (Panel A)
Predose, 0.25 and 24 hours post-infusion on Day 1

The clearance (CL) of IV POS is based on population PK analysis.

Area under the plasma concentration-time curve from dosing to infinity (AUC0-∞) of single-dose IV POS (Panel A)
Predose, 0.25 and 24 hours post-infusion on Day 1

The AUC0-∞ of IV POS is based on population PK analysis.

Cavg of multiple-dose IV POS (Panel B)
Predose and 0.25 post-infusion on Day 1; Weeks 1, 2, 4, 6, 9, and 12

The Cavg of IV POS is based on population PK analysis.

Cmax of multiple-dose IV POS (Panel B)
Predose and 0.25 post-infusion on Day 1; Weeks 1, 2, 4, 6, 9, and 12

The Cmax of IV POS is based on population PK analysis.

Tmax of multiple-dose IV POS (Panel B)
Predose and 0.25 post-infusion on Day 1; Weeks 1, 2, 4, 6, 9, and 12

The Tmax of IV POS is based on population PK analysis.

AUC0-24 of multiple-dose IV POS (Panel B)
Predose and 0.25 post-infusion on Day 1; Weeks 1, 2, 4, 6, 9, and 12

The AUC0-24 of IV POS is based on population PK analysis.

CL of multiple-dose IV POS (Panel B)
Predose and 0.25 post-infusion on Day 1; Weeks 1, 2, 4, 6, 9, and 12

The CL of IV POS is based on population PK analysis.

Cavg of multiple-dose PFS POS (Panel B)
Predose and 0.25 post-infusion on Day 1; Weeks 1, 2, 4, 6, 9, and 12

The Cavg of PFS POS is based on population PK analysis.

Cmax of multiple-dose PFS POS (Panel B)
Predose and 0.25 post-infusion on Day 1; Weeks 1, 2, 4, 6, 9, and 12

The Cmax of PFS POS is based on population PK analysis.

AUC0-24 of multiple-dose PFSPOS (Panel B)
Predose and 0.25 post-infusion on Day 1; Weeks 1, 2, 4, 6, 9, and 12

The AUC0-24 of PFS POS is based on population PK analysis.

Secondary Endpoints

Cavg of IV POS in neonates and infants <2 years of age compared to adults and older pediatric populations (Panel B)
Predose and 0.25 post-infusion on Day 1; Weeks 1, 2, 4, 6, 9, and 12
Percentage of participants with an ≥ 1 adverse event (AE) [Panels A and B]
Up to 98 days
Percentage of participants who discontinued study therapy due to an AE (Panels A and B)
Up to 84 days
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Panel A: POS IVEXPERIMENTALPosaconazole 6 mg/kg body weight administered in a single dose by IV infusion on Day 1.
Panel B: POS IVEXPERIMENTALPosaconazole 6 mg/kg body weight administered twice daily by IV infusion on Day 1, and then once daily from Day 2 to a maximum 84 days.
Panel B: POS PFSEXPERIMENTALFollowing a minimum of 7 days IV dosing, participants as clinically able will be transitioned from POS IV to POS PFS nominal 6 mg/kg body weight based on weight bands administered on Day 8, once daily to a maximum 84 days.

Interventions

NameTypeDescription
Posaconazole IV 6 mg/kgDRUGPOS 6 mg/kg body weight by IV infusion
Posaconazole PFS 6 mg/kgDRUGPOS nominal 6 mg/kg body weight based on weight bands taken orally
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Eligibility Criteria

Age Range1 Day to 2 Years
SexALL
Healthy VolunteersNo
Study Sites26

Inclusion Criteria: * Panel A: is undergoing treatment for possible, probable, or proven IFI known or suspected to be cause by fungal pathogens against which POS has demonstrated activity (which can include candidiasis) * Panel B: has an investigator-assessed diagnosis of possible, probable, or pro...

Countries:United StatesBelgiumGreeceIsraelMexicoPeruPolandRussiaSouth KoreaUkraine
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Recent Changes (Last 90 Days)

MEDIUMAug 12, 2026NCT04665037primaryCompletionDate: changed
MEDIUMAug 12, 2026NCT04665037primaryCompletionDate: changed

Frequently asked questions about Posaconazole/kg

What is Posaconazole used for?

Posaconazole is an antifungal drug in Phase 3 development for the prevention and treatment of invasive fungal infections, including invasive aspergillosis, in patients with neutropenia or leukopenia. It is also studied for other fungal infections. It is being developed by Merck & Company, Inc. (MRK).

How does Posaconazole work?

Posaconazole is a small molecule antifungal that works by inhibiting the synthesis of ergosterol, a key component of the fungal cell membrane. This action disrupts the fungal cell membrane, leading to cell death. It is being studied for use in patients with compromised immune systems who are at risk for invasive fungal infections.

Who makes Posaconazole?

Posaconazole is being developed by Merck & Company, Inc., a pharmaceutical company traded on the New York Stock Exchange under the ticker symbol MRK. The company is conducting clinical trials to evaluate the drug's efficacy and safety in treating and preventing invasive fungal infections.

What phase is Posaconazole in?

Posaconazole is currently in Phase 3 clinical development for the treatment of invasive fungal infections. It is an investigational drug and has not yet been approved by regulatory authorities. The drug is also being studied in earlier phase trials for other indications, including Chagas disease.

What clinical trials is Posaconazole in?

Posaconazole has been studied in several clinical trials, including NCT00034671 and NCT00550732 for refractory fungal infections, NCT01377480 for Chagas disease, and NCT04665037 for invasive fungal infection in children under 2 years. These trials have enrolled a total of 1074 participants across various phases.

Is Posaconazole the same as Posaconazole IV 6 mg/kg?

Posaconazole IV 6 mg/kg is a formulation and dosing regimen of Posaconazole. The drug is also known by this name, which specifies the intravenous administration at a dose of 6 mg per kilogram of body weight. This formulation is used in clinical studies to evaluate the drug's pharmacokinetics and efficacy.