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Resmetirom

Phase 3

NASH | Small molecule | Metabolic |Madrigal Pharmaceuticals, Inc.|Last Updated: Sep 11, 2026

Target and mechanism

Molecular targetTHRB
Target classAgonist
ModalitySmall molecule

Also known as MGL-3196, MGL-3196 Tablet, MGL-3196 (resmetirom)

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLEDDMC
Total Trials1
Total Enrollment845

FDA Designations

BREAKTHROUGH_THERAPYACCELERATED_APPROVALPRIORITY_REVIEW

Clinical trial landscape

Resmetirom · 16 trials · 11 indications

Phase 3 4Phase 2 4Phase 1 8
NCT05500222A Phase 3 Study to Evaluate the Effect of Resmetirom on Clinical Outcomes in Patients With Well-compensated NASH Cirrhosis (MAESTRO-NASH-OUTCOMES)NASH
ACTIVE NOT_RECRUITING845 Analytics
NCT04951219A Phase 3 Study to Evaluate Safety and Biomarkers of Resmetirom (MGL-3196) in Patients With Non-alcoholic Fatty Liver Disease (NAFLD), MAESTRO-NAFLD-Open-Label-Extension (MAESTRO-NAFLD-OLE)Non-Alcoholic Fatty Liver Disease
ACTIVE NOT_RECRUITING810 Analytics
NCT04197479A Phase 3 Study to Evaluate Safety and Biomarkers of Resmetirom (MGL-3196) in Non Alcoholic Fatty Liver Disease PatientsNon-Alcoholic Fatty Liver Disease
COMPLETED1,343 Analytics
NCT03900429A Phase 3 Study to Evaluate the Efficacy and Safety of MGL-3196 (Resmetirom) in Patients With NASH and FibrosisNASH - Nonalcoholic Steatohepatitis
ACTIVE NOT_RECRUITING1,759 Analytics
PHASE3ACTIVE NOT_RECRUITING
A Phase 3 Study to Evaluate the Effect of Resmetirom on Clinical Outcomes in Patients With Well-compensated NASH Cirrhosis (MAESTRO-NASH-OUTCOMES)
NASHUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Phase 3 Study to Evaluate Safety and Biomarkers of Resmetirom (MGL-3196) in Patients With Non-alcoholic Fatty Liver Disease (NAFLD), MAESTRO-NAFLD-Open-Label-Extension (MAESTRO-NAFLD-OLE)
Non-Alcoholic Fatty Liver DiseaseUnlock trial analytics
PHASE3COMPLETED
A Phase 3 Study to Evaluate Safety and Biomarkers of Resmetirom (MGL-3196) in Non Alcoholic Fatty Liver Disease Patients
Non-Alcoholic Fatty Liver DiseaseUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
A Phase 3 Study to Evaluate the Efficacy and Safety of MGL-3196 (Resmetirom) in Patients With NASH and Fibrosis
NASH - Nonalcoholic SteatohepatitisUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence Of adjudicated Composite Clinical Outcome event
Baseline up to Month 36

Any event of all-cause mortality, liver transplant, ascites, hepatic encephalopathy, gastroesophageal variceal hemorrhage, and confirmed increase of MELD score from \<12 to \>/= 15 due to liver disease

The effect of once daily, oral administration of resmetirom on the incidence of adverse events.
52 weeks
The effect of once daily, oral administration of 80 or 100 mg resmetirom versus placebo on the incidence of adverse events.
52 weeks
Week 52 Dual Primary Objectives: To determine the effect of 80 or 100 mg MGL-3196 vs matching placebo on liver biopsy (NASH CRN score) at Week 52 compared with Baseline
52 weeks

1. Proportion with resolution of NASH (ballooning 0, inflammation 0,1) associated with at least 2-point reduction in NAFLD Activity Score (NAS) without worsening of fibrosis stage OR 2. Proportion with at least a 1-point improvement in fibrosis stage with no worsening of NAS

Month 54 Primary Objective: Time to experiencing an adjudicated Composite Clinical Outcome event (Final Primary Endpoint, at 54 months)
up to 54 months

The Composite Clinical Outcome is composed of all-cause mortality, liver transplant, and significant hepatic events (including hepatic decompensation events \[ascites, encephalopathy, or gastroesophageal variceal hemorrhage\], histological progression to cirrhosis, and a confirmed increase of MELD score from \<12 to ≥15).

Safety and tolerability of multiple ascending doses of resmetirom
Baseline through approximately Day 21 (or the protocol-defined safety follow-up period)

Safety and tolerability will be assessed by the incidence and severity of adverse events, serious adverse events, clinical laboratory evaluations, vital signs, 12-lead electrocardiograms, physical examinations, and other protocol-defined safety assessments.

Percent change from baseline in liver fat content (LFC) as assessed by MRI-PDFF at Week 28
28 weeks

To determine the effect of MGL-3196/Resmetirom versus matching placebo on percent change from Baseline to Week 28 in hepatic fat fraction by magnetic resonance imaging proton density fat fraction (MRI-PDFF) in patients with baseline MRI-PDFF ≥8%.

Mean Percent Change in LDL-C From Baseline To Week 12
Baseline up to Week 12

LDL-C was determined by ultracentrifugation or direct measure. Least-squares (LS) mean was provided for the comparison of MGL-3196 versus placebo and it used a linear model with percent change from baseline as the dependent variable and treatment as a factor.

Percent Change From Baseline To Week 12 In Hepatic Fat Fraction Assessed By Magnetic Resonance Imaging Proton Density Fat Fraction (MRI-PDFF)
Week 12

The primary endpoint was relative change in MRI-PDFF assessed hepatic fat fraction compared with placebo at Week 12 in participants who had both a baseline and Week 12 MRI-PDFF. Least squares (LS) mean was provided for the statistical comparison of MGL-3196 versus placebo.

Plasma pharmacokinetics - Cmax
8 days

Cmax after administration

Plasma pharmacokinetics - Tmax
8 days

Tmax after administration

Plasma pharmacokinetics - AUC(0-Last)
8 days

AUC(0-Last) after administration

Plasma pharmacokinetics - t1/2
8 days

t1/2 after administration

AUC from the time of dosing of clopidogrel as affected by single and multiple daily dosing with MGL-3196 100 mg/day in healthy subjects
14 days
Pharmacokinetics (Cmax) of clopidogrel as affected by chronic dosing with MGL-3196 100 mg/day in healthy subjects
14 days
AUC from the time of dosing of pioglitazone as affected by chronic dosing with MGL-3196 100 mg/day in healthy subjects
17 days
Plasma pharmacokinetics - AUC (0-last)
16 days

AUC (0-last) after administration

Effect on the incidence of adverse events
16 days
Area under the curve from the time of dosing extrapolated to infinity (AUC(0-inf))
48 hours

comparison between MGL-3196 capsules and MGL-3196 tablets

Mass Balance of [14C] MGL-3196
Approximately 10 Days

Measurement of the total radioactivity collected from blood, urine, and feces

Area under the curve from the time of dosing extrapolated to infinity (AUC(0-inf)) of Atorvastatin as affected by MGL-3196
72 hours
Area under the curve from the time of dosing extrapolated to infinity (AUC(0-inf)) of Rosuvastatin as affected by MGL-3196
72 hours
AUC(0-inf) of Simvastatin as affected by MGL-3196
24 hours

Secondary Endpoints

Percent change in the hepatic fat fraction as determined by MRI-PDFF from baseline
16 weeks
Percent change in LDL-C from baseline
28 weeks
The effect of once daily, oral administration of 80 or 100 mg resmetirom versus placebo on the percent change in low density lipoprotein C (LDL-C) from baseline to Week 24
24 weeks
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Study Design & Arms

AllocationRANDOMIZED
MaskingTRIPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
ResmetiromACTIVE_COMPARATOR80 mg daily
PlaceboPLACEBO_COMPARATORmatching placebo daily
Double-blind 80 mg DailyEXPERIMENTALFor patients assigned to double-blind treatment and who completed Week 52 and 56 of MAESTRO-NAFLD-1, double-blind resmetirom 80 mg for first 12 weeks followed by open-label resmetirom 100 mg for weeks 12-52
Double-blind 100 mg DailyEXPERIMENTALFor patients assigned to double-blind treatment and who completed Week 52 and 56 of MAESTRO-NAFLD-1, double-blind resmetirom 100 mg for first 12 weeks followed by open-label resmetirom 100 mg for weeks 12-52
Open-labelEXPERIMENTALFor patients assigned to open-label treatment and who completed Week 52 and 56 of MAESTRO-NAFLD-1, open-label resmetirom at same dose as MGL-3196-14 for an additional 52 weeks. NASH cirrhosis patients may receive open-label resmetirom for up to an additional 66 months (ie, 52 weeks in MGL-3196-14 and up to 66 months in MGL-3196-18).
Open-Label 80 mgEXPERIMENTALFor patients with NASH cirrhosis who were screen failures from MGL-3196-11, open-label resmetirom 80 mg for up to 66 months.
Open Label 100 mgEXPERIMENTALFor patients without NASH cirrhosis who were screen failures from MGL-3196-11, open-label resmetirom 100 mg for 52 weeks
Open-Label 40 mgEXPERIMENTALFor NASH cirrhosis patients who enter MGL-3196-18 directly or were screen failures from MGL-3196-19, open-label resmetirom 40 mg for up to 66 months.
Open label: resmetiromEXPERIMENTAL100 mg daily
Double blinded: matching placeboPLACEBO_COMPARATORPlacebo daily
Double blinded: resmetirom 80 mgEXPERIMENTAL80 mg daily
Double blinded: resmetirom 100 mgEXPERIMENTAL100 mg daily
Matching PlaceboPLACEBO_COMPARATORPlacebo Daily
80 mg MGL-3196ACTIVE_COMPARATOR80 mg daily
100 mg MGL-3196ACTIVE_COMPARATOR100 mg daily
Adolescent Dose-Escalation Cohort 1EXPERIMENTALAdolescents participants 12 to 17 years of age receive the first planned dose level of oral resmetirom once daily for approximately 14 days
Adolescent Dose-Escalation Cohort 2EXPERIMENTALAdolescent participants 12 to 17 years of age receive the second planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
Adolescent Dose-Escalation Cohort 3EXPERIMENTALAdolescent participants 12 to 17 years of age receive the third planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
Adolescent Dose-Escalation Cohort 4EXPERIMENTALAdolescent participants 12 to 17 years of age receive the fourth planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
Adolescent Dose-Escalation Cohort 5EXPERIMENTALAdolescent participants 12 to 17 years of age receive the fifth planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
Child Dose-Escalation Cohort 6EXPERIMENTALChildren participants 6 to 11 years of age receive the first planned dose level of oral resmetirom once daily for approximately 14 days.
Child Dose-Escalation Cohort 7EXPERIMENTALChildren participants 6 to 11 years of age receive the second planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
Child Dose-Escalation Cohort 8EXPERIMENTALChildren participants 6 to 11 years of age receive the third planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
Child Dose-Escalation Cohort 9EXPERIMENTALChildren participants 6 to 11 years of age receive the fourth planned dose level of oral resmetirom once daily for approximately 14 days following review of safety and PK data.
Arm 1: Resmetirom 80 or 100 mg daily - Cohort 1ACTIVE_COMPARATOR -
Arm 2: Resmetirom 80 or 100 mg daily - Cohort 2ACTIVE_COMPARATOR -
Arm 3: Placebo - Cohort 1PLACEBO_COMPARATOR -
Arm 4: Placebo - Cohort 2PLACEBO_COMPARATOR -
MGL-3196EXPERIMENTALStudy Drug
Severe renal impairmentEXPERIMENTAL -
Normal Healthy MatchEXPERIMENTALMatched to severe renal impairment
MGL-3196 100 mg tablet plus Clopidogrel 75 mg tabletEXPERIMENTAL -
MGL-3196 100 mg tablet plus Pioglitazone 15 mg tabletEXPERIMENTALMGL-3196 administered orally plus Pioglitazone administered orally on 2 separate days
40 mg MGL-3196 TabletEXPERIMENTALMultiple cohorts (normal, varying hepatic impairment, NASH non-cirrhosis, and NASH cirrhosis) evaluated
60 mg MGL-3196 TabletEXPERIMENTALMultiple cohorts (normal, varying hepatic impairment, NASH non-cirrhosis, and NASH cirrhosis) evaluated
80 mg MGL-3196 TabletEXPERIMENTALMultiple cohorts (normal, varying hepatic impairment, NASH non-cirrhosis, and NASH cirrhosis) evaluated
100 mg MGL-3196 TabletEXPERIMENTALMultiple cohorts (normal, varying hepatic impairment, NASH non-cirrhosis, and NASH cirrhosis) evaluated
Capsule then TabletACTIVE_COMPARATORMGL-3196 Capsule on Day 1 followed by MGL-3196 Tablet on Day 5
Tablet then CapsuleACTIVE_COMPARATORMGL-3196 Tablet on Day 1 followed by MGL-3196 Capsule on Day 5
TreatmentEXPERIMENTALMGL-3196

Interventions

NameTypeDescription
ResmetiromDRUGRandomized 80 mg
PlaceboDRUGrandomized matching placebo
MGL-3196DRUGTablet
Liver BiopsyPROCEDUREA procedure in which a needle is inserted into the liver to collect a tissue sample
MGL-3196 (resmetirom)DRUGOral
100 mg Resmetirom TabletDRUGOnce daily oral dose for 6 days
ClopidogrelDRUGAfter one-day washout period after Day 1, loading dose of 300 mg clopidogrel administered on Day 3 and then, at approximately the same time each morning, 75 mg clopidogrel administered on Days 4 to 11
Pioglitazone 15mgDRUGPioglitazone 15 mg tablet administered orally on 2 separate days, initially on one day alone and again after MGL-3196 has been dosed to steady-state
MGL-3196 TabletDRUGMGL-3196 in Tablet form
MGL-3196 CapsuleDRUGMGL-3196 in Capsule form
AtorvastatinDRUG -
SimvastatinDRUG -
RosuvastatinDRUG -
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites141

Inclusion Criteria: * A clinical diagnosis of NASH cirrhosis * At least 3 metabolic risk factors * Historical liver biopsy read as consistent with NASH cirrhosis. * Historical biopsy consistent with NASH with significant fibrosis, now with progression to cirrhosis. Or, no historical biopsy, with a ...

Countries:United StatesBelgiumCanadaFranceGermanyItalyPuerto RicoSpainUnited KingdomAustraliaAustriaHungaryIsraelMexicoPolandSwitzerlandDenmarkNetherlandsNorway
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Recent Changes (Last 90 Days)

LOWSep 11, 2026NCT07763015Status: NOT_YET_RECRUITING → RECRUITING
LOWSep 11, 2026NCT07763015Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 26, 2026NCT07335601lastUpdatePostDate: changed
LOWAug 26, 2026NCT07335601lastUpdatePostDate: changed
LOWAug 14, 2026NCT07763015NEW_TRIAL: changed
LOWAug 14, 2026NCT07763015NEW_TRIAL: changed
LOWAug 14, 2026NCT07763015NEW_TRIAL: changed
LOWJul 31, 2026NCT07335601lastUpdatePostDate: changed
LOWJul 31, 2026NCT07335601lastUpdatePostDate: changed
LOWJul 8, 2026NCT05500222lastUpdatePostDate: changed
LOWJul 8, 2026NCT05500222lastUpdatePostDate: changed
MEDIUMJul 5, 2026NCT03038022TRIAL_REMOVED: changed
MEDIUMJul 5, 2026NCT03038022TRIAL_REMOVED: changed
MEDIUMJul 5, 2026NCT03038022TRIAL_REMOVED: changed
LOWJun 16, 2026NCT07335601lastUpdatePostDate: changed
LOWJun 16, 2026NCT07335601lastUpdatePostDate: changed
LOWJun 16, 2026NCT07335601lastUpdatePostDate: changed

Frequently asked questions about Resmetirom

What is Resmetirom used for?

Resmetirom is an investigational small molecule being developed for MASH (metabolic dysfunction-associated steatohepatitis), formerly called NASH, and related liver conditions including non-alcoholic fatty liver disease and NASH cirrhosis. It is also being studied in patients with renal impairment and in children and adolescents with MASH.

What does Resmetirom target?

Resmetirom targets THRB, the thyroid hormone receptor beta. It acts as an agonist at this receptor. By activating thyroid hormone receptor beta, resmetirom is designed to influence metabolic and liver-related pathways relevant to MASH and NASH.

Who is developing Resmetirom?

Resmetirom is being developed by Madrigal Pharmaceuticals, Inc., which trades under the ticker MDGL. The company is the sponsor of the clinical trials evaluating resmetirom in MASH, NASH, and related conditions.

What phase is Resmetirom in?

Resmetirom is in clinical development, with trials across Phase 1, Phase 2, and Phase 3. The Phase 3 MAESTRO-NASH-OUTCOMES study is active but not recruiting, and two Phase 2 studies in children and post-liver transplant patients are currently recruiting. It has received FDA designations including Breakthrough Therapy, Accelerated Approval, and Priority Review.

What clinical trials is Resmetirom in?

Resmetirom is being evaluated in several trials, including NCT07763015, a Phase 2 study in children and adolescents with MASH; NCT07335601, a Phase 2 study in post-liver transplant patients with MASH; NCT06397872, a completed Phase 1 study in severe renal impairment; and NCT05500222, the Phase 3 MAESTRO-NASH-OUTCOMES study in well-compensated NASH cirrhosis.

Is Resmetirom the same as NASH?

No, resmetirom is a drug candidate, not a disease. NASH, now referred to as MASH, is the liver condition that resmetirom is being developed to treat. Resmetirom is an investigational therapy, not a synonym for the disease.