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WithdrawnNCT04128462Updated Sep 22, 2021

MNK-6105 for Patients With Cirrhosis and High Ammonia Levels Affecting Brain Function

A Phase 3 interventional study of MNK-6105 and Placebo in Hepatic Encephalopathy, sponsored by Mallinckrodt. Withdrawn. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2021-09-22.

Sponsored by Mallinckrodt · Phase 3, Interventional, and Treatment

Why this study was withdrawn
Business Decision
Phase
Phase 3
Study type
Interventional
Enrollment
0
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Study summary

This study is for patients with cirrhosis and hepatic encephalopathy who are in the hospital. This means they have a high ammonia level which is affecting their brain function.

All patients will receive the standard of (regular) care. Each will have an equal chance (like flipping a coin) of receiving the experimental drug or placebo along with the standard care.

Each patient will have tests during the first 24 hours, receive treatment for up to 5 days, and have 30 days of follow-up.

02

Conditions studied

  • Hepatic Encephalopathy

Keywords

  • Overt HE diagnosis
03

In context

Hepatic Encephalopathy

225 studies on the registry are indexed under Hepatic Encephalopathy; 53 are open to participants now.

Browse Hepatic Encephalopathy studies →

Lead sponsor

Mallinckrodt is the lead sponsor of 87 studies on the registry; none are open to participants now.

Of its 15 completed or terminated interventional studies of FDA-regulated products, 15 (100%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

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.

Inclusion criteria

To be included, a patient must:

  • Be the age of majority in their country (considered an adult)
  • Be male or non-pregnant, non-lactating female
  • Have OHE (Stage 2, 3, or 4) as a complication of cirrhosis
  • Have been hospitalized within 24 hours before start of infusion (SOI)
  • Receive at least 6 hours of SoC treatment

Exclusion criteria

Exclusion Criteria:

Patients will be excluded if they have inadequate renal function or any other disease, laboratory value, or condition (including allergy, drug use or treatments) that per protocol or in the opinion of the investigator, might increase the risk of compromising:

  1. health or well-being of the patient
  2. safety of study staff
  3. analysis of results
05

Study design

Phase
Phase 3
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Participant, Investigator)
Enrollment
0 participants (actual)

Study arms

  • Experimental
    MNK6105 + SoC

    Participants will receive standard of care (SoC), along with MNK-6105 delivered by continuous intravenous (IV) infusion as follows: * Loading dose: 20 g infused over 6 hours * Intermediate dose: 15 g infused over 18 hours * Maintenance dose: 15 g infused over 24 hours for up to 4 days

    Drug: MNK-6105 · Drug: Standard of Care

  • Placebo comparator
    Placebo + SoC

    Participants will receive SoC, along with continuous IV infusion of matching placebo for 5 days.

    Drug: Placebo · Drug: Standard of Care

Interventions

  • DrugMNK-6105

    L-Ornithine Phenylacetate for IV infusion

    Also known as: L-Ornithine Phenylacetate

  • DrugPlacebo

    Matching placebo for IV infusion

    Also known as: Matching Placebo

  • DrugStandard of Care

    Lactulose ± rifaximin as SoC treatment for overt HE should be administered per the clinical judgement of the investigator and usual institutional practice.

    Also known as: SoC

06

What researchers measure

Primary outcomes

  1. Number of patients with a clinical response at Day 5

    Time frame: at Day 5 (within 36 months)

Secondary outcomes

  1. Number of patients discharged 30 days after end of treatment.

    Time frame: at Day 35 (within 36 months)

  2. Number of patients readmitted to the hospital due to overt hepatic encephalopathy (OHE) 30 days after discharge.

    Time frame: 30 days after discharge (within 36 months)

  3. Number of patients with adverse events or deaths during the study

    Time frame: within 36 months

07

Study locations

No study locations are listed for this record.

08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Sep 22, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04128462
Lead sponsor
Mallinckrodt
Responsible party
Sponsor
First posted
Oct 16, 2019
Start date
Nov 2021 (estimated)
Primary completion
Apr 2025 (estimated)
Completion
Jul 2025 (estimated)
Last update
Sep 22, 2021

Study contacts

Clinical Team Leader
study director · Mallinckrodt

Oversight

Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is withdrawn, as verified in Sep 2021. You cannot join it, but the record below documents what was studied.

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