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Aficamten

Phase 4FDA approved

Obstructive Hypertrophic Cardiomyopathy (oHCM) | Small molecule | Cardiovascular |Cytokinetics, Incorporated|Trials Updated: Oct 13, 2026

Aficamten development status

FDA approval on record Dec 19, 2025 as Myqorzo
Approval holderCytokinetics
ApplicationNDA219083
Highest phase Phase 4 (NCT07600177)
Phase scored for CYTKPhase 3
Registered trials 5 across 3 sponsors since Jun 2023

Label indication MYQORZO is indicated for the treatment of adults with symptomatic obstructive hypertrophic cardiomyopathy (oHCM) to improve functional capacity and symptoms. MYQORZO is a cardiac myosin inhibitor indicated for the treatment of adults with symptomatic obstructive hypertrophic cardiomyopathy (oHCM) to improve functional capacity and symptoms. ( 1 ) FDA label

Aficamten target and mechanism

Molecular targetcardiac myosin
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLEDDMC
Total Trials5
Total Enrollment1,922

FDA Designations

No designations recorded

Aficamten clinical trials

Aficamten · 5 trials · 5 indications

Phase 3 3Phase 2 2
NCT06081894A Trial to Evaluate the Efficacy and Safety of Aficamten Compared to Placebo in Adults With Symptomatic Non-Obstructive Hypertrophic Cardiomyopathy (nHCM)Symptomatic Non-Obstructive Hypertrophic Cardiomyopathy
ACTIVE NOT_RECRUITING500 Analytics
NCT05767346Phase 3 Trial to Evaluate the Efficacy and Safety of Aficamten Compared to Metoprolol Succinate in Adults With Symptomatic oHCMObstructive Hypertrophic Cardiomyopathy (oHCM)
COMPLETED175 Analytics
NCT05186818Phase 3 Trial to Evaluate the Efficacy and Safety of Aficamten Compared to Placebo in Adults With Symptomatic oHCMObstructive Hypertrophic Cardiomyopathy (oHCM)
COMPLETED282 Analytics
PHASE3ACTIVE NOT_RECRUITING
A Trial to Evaluate the Efficacy and Safety of Aficamten Compared to Placebo in Adults With Symptomatic Non-Obstructive Hypertrophic Cardiomyopathy (nHCM)
Symptomatic Non-Obstructive Hypertrophic CardiomyopathyUnlock trial analytics
PHASE3COMPLETED
Phase 3 Trial to Evaluate the Efficacy and Safety of Aficamten Compared to Metoprolol Succinate in Adults With Symptomatic oHCM
Obstructive Hypertrophic Cardiomyopathy (oHCM)Unlock trial analytics
PHASE3COMPLETED
Phase 3 Trial to Evaluate the Efficacy and Safety of Aficamten Compared to Placebo in Adults With Symptomatic oHCM
Obstructive Hypertrophic Cardiomyopathy (oHCM)Unlock trial analytics

Study Endpoints

Primary Endpoints

Change in Kansas City Cardiomyopathy Questionnaire - Clinical Summary Score (KCCQ-CSS)
Baseline to Week 36

Effect of aficamten compared with placebo on participant health status

Change in pVO2
Baseline to Week 36

Effect of aficamten compared with placebo on maximal exercise capacity

Change in Peak Oxygen Uptake (pVO2) by Cardiopulmonary Exercise Testing (CPET)
Baseline to Week 24

Effect of aficamten compared with metoprolol succinate on exercise capacity in patients with symptomatic obstructive hypertrophic cardiomyopathy (oHCM). Exercise capacity was determined through changes in peak oxygen uptake (pVO2) after 24 weeks of treatment. pVO2 was measured by cardiopulmonary exercise testing (CPET) on a treadmill or bicycle. A higher pVO2 indicates better cardiorespiratory fitness.

Change From Baseline in pVO2 at Week 24
Baseline to Week 24

The effect of CK-3773274 on exercise capacity in participants with symptomatic obstructive hypertrophic cardiomyopathy (oHCM) was determined through changes in peak oxygen uptake (pVO2) after 24 weeks of treatment. pVO2 was measured by cardiopulmonary exercise testing (CPET) on a treadmill or bicycle. A higher pVO2 indicates better cardiorespiratory fitness.

Change from baseline in Valsalva left ventricular outflow tract gradient (LVOT-G)
Baseline to week 12 (Period 1)
Incidence of adverse events observed during dosing of aficamten in patients with HCM
Baseline to End of study, up to 5 years

Patient incidence of reported Adverse Events (AEs)

Incidence of serious adverse events observed during dosing of aficamten in patients with HCM
Baseline to End of study, up to 5 years

Patient incidence of reported Serious Adverse Events (SAEs)

Incidence of left ventricular ejection fraction (LVEF) < 50% observed during dosing of aficamten in patients with HCM
Baseline to End of study, up to 5 years

Patient incidence of reported LVEF \<50%

Secondary Endpoints

Change in composite of two Z-scores of CPET parameters (pVO2 and VE/VCO2 slope)
Baseline to Week 36
Proportion of participants with ≥ 1 class improvement in New York Heart Association (NYHA) Functional Class
Baseline to Week 36
Change in N-terminal prohormone brain natriuretic peptide (NT-proBNP)
Baseline to Week 36
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
AficamtenEXPERIMENTALParticipants in this arm will receive a single daily oral dose of 5 mg, 10 mg, 15 mg, or 20 mg of aficamten with dose levels guided by echocardiography assessments, for up to 72 weeks.
PlaceboPLACEBO_COMPARATORParticipants in this arm will receive placebo, for up to 72 weeks.
Aficamten up to 20 mg plus placebo for metoprololEXPERIMENTALPatients will receive doses of 5 mg, 10 mg, 15 mg or 20 mg of aficamten (CK-3773274) plus placebo for metoprolol succinate with dose levels guided by echocardiography assessments for up to 24 weeks.
Metoprolol succinate up to 200 mg plus placebo for aficamtenACTIVE_COMPARATORPatients will receive 50 mg, 100 mg, 150 mg or 200 mg of metoprolol succinate plus placebo for aficamten (CK-3773274) with dose levels guided by echocardiography and heart rate assessments for up to 24 weeks.
Aficamten up to 20 mgEXPERIMENTALParticipants received 5 mg, 10 mg, 15 mg, or 20 mg of aficamten; dose levels were guided by echocardiography assessments. Treatment was administered for up to 24 weeks.
Placebo to match aficamtenPLACEBO_COMPARATORParticipants received placebo for up to 24 weeks.

Interventions

NameTypeDescription
AficamtenDRUGOral Tablet
PlaceboDRUGOral Tablet
Aficamten (CK-3773274) (5 mg, 10 mg, 15 mg and 20 mg)DRUGAficamten (CK-3773274) tablets administered orally
Placebo to match aficamtenDRUGPlacebo for aficamten (CK-3773274) administered orally
Metoprolol succinate (50 mg, 100 mg, 150 mg and 200 mg)DRUGMetoprolol succinate tablets administered orally
Placebo to match metoprolol succinateDRUGPlacebo for metoprolol succinate administered orally
Aficamten (5 mg, 10 mg, 15 mg, and 20 mg)DRUGAficamten tablets were administered orally once daily.
Aficamten (5 - 20 mg)DRUGAficamten tablets, 5-20 mg daily, administered orally. Participants may continue on Aficamten until end of treatment criteria defined in the protocol is met.
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Eligibility Criteria

Age Range18 Years to 85 Years
SexALL
Healthy VolunteersNo
Study Sites180

Inclusion Criteria: * Between 18-85 years of age * Body mass index \< 40 kg/m2 * Diagnosed with nHCM and has a screening echocardiogram with the following: * End-diastolic left ventricular (LV) wall thickness: * ≥ 15 mm in one or more myocardial segments OR * ≥ 13 mm in one or more wall...

Countries:United StatesArgentinaAustraliaBrazilCanadaChinaDenmarkFranceGermanyGreeceHungaryIcelandIsraelItalyJapanNetherlandsPolandPortugalSpainUnited KingdomCzechia
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Recent Changes (Last 90 Days)

MEDIUMOct 13, 2026NCT04848506primaryCompletionDate: changed
MEDIUMOct 13, 2026NCT04848506primaryCompletionDate: changed
LOWSep 22, 2026NCT06081894primaryCompletionDate: changed
LOWSep 22, 2026NCT06081894primaryCompletionDate: changed
MEDIUMAug 19, 2026NCT06412666Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMAug 19, 2026NCT06412666Status: RECRUITING → ACTIVE_NOT_RECRUITING
MEDIUMAug 19, 2026NCT06412666Status: RECRUITING → ACTIVE_NOT_RECRUITING
LOWAug 5, 2026NCT06081894primaryCompletionDate: changed

Frequently asked questions about Aficamten

What is aficamten used for?

Aficamten is an investigational small molecule being developed for hypertrophic cardiomyopathy, including symptomatic obstructive hypertrophic cardiomyopathy (oHCM) and symptomatic non-obstructive hypertrophic cardiomyopathy. It is also being studied in pediatric patients with symptomatic obstructive hypertrophic cardiomyopathy. It is not yet approved for any indication.

What does aficamten target?

Aficamten targets cardiac myosin. By modulating cardiac myosin, it aims to reduce excessive contractility in the heart muscle, which is a characteristic feature of hypertrophic cardiomyopathy. This mechanism is intended to address the underlying pathophysiology of both obstructive and non-obstructive forms of the disease.

Who is developing aficamten?

Aficamten is being developed by Cytokinetics, Incorporated, which trades on the Nasdaq under the ticker CYTK. Cytokinetics is a biopharmaceutical company focused on discovering and developing muscle-directed therapeutics for cardiovascular and neuromuscular diseases.

What phase is aficamten in?

Aficamten is in Phase 3 clinical development. Two Phase 3 trials in adults with symptomatic obstructive hypertrophic cardiomyopathy have been completed, and a Phase 3 trial in adults with symptomatic non-obstructive hypertrophic cardiomyopathy is active but not recruiting. A Phase 2 trial in pediatric patients is also active but not recruiting.

What clinical trials is aficamten in?

Aficamten has been studied in four registered trials. Completed Phase 3 trials include NCT05186818 (versus placebo in oHCM) and NCT05767346 (versus metoprolol succinate in oHCM). Ongoing trials include NCT06081894 (Phase 3 in non-obstructive HCM) and NCT06412666 (Phase 2 in pediatric oHCM).

Is aficamten the same as CK-3773274?

Yes, aficamten is also known by its development code CK-3773274. The drug has been investigated in multiple dose strengths, including 5 mg, 10 mg, 15 mg, and 20 mg. These alternative names and dose descriptions refer to the same investigational compound.