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Posaconazole /kg

Phase 2

Invasive Fungal Infection | Small molecule | Infectious Disease |Merck & Company, Inc.|Last Updated: Sep 18, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDDMC
Total Trials1
Total Enrollment40
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04665037Posaconazole (MK-5592) Intravenous and Oral in Children (<2 Years) With Invasive Fungal Infection (MK-5592-127)PHASE2 RECRUITING 40Feb 22, 2022Dec 31, 2026Sep 18, 202526 United States, Belgium +8
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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 — 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)
LOWMay 26, 2026NCT04665037primaryCompletionDate: changed
LOWMay 24, 2026NCT04665037studyFirstPostDate: changed