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Frequently Asked Questions

Frequently asked questions about CAMZYOS® (mavacamten):

Efficacy and Outcomes

EXPLORER-HCM Study Design1,2

The efficacy and safety of CAMZYOS was evaluated in EXPLORER-HCM, a Phase 3, randomized, double-blind, placebo-controlled study that enrolled 251 adult patients with symptomatic NYHA Class II–III obstructive HCM, LVEF ≥55%, and LVOT peak gradient ≥50 mmHg at rest or with provocation. Patients were randomized in a 1:1 ratio to receive a starting dose of 5 mg of CAMZYOS (n=123) or placebo (n=128) once daily for 30 weeks. The dose was periodically adjusted to optimize patient response (following LVEF, Valsalva LVOT Gradient, and pharmacokinetics). 92% of patients were on background therapy with a beta blocker or calcium channel blocker in the pooled CAMZYOS (n=119/123) and placebo (n=112/128) groups.

Patients could achieve the primary composite functional endpoint with either ≥1 NYHA class improvement and ≥1.5 mL/kg/min improvement in pVO2, or no worsening in NYHA class and ≥3.0 mL/kg/min improvement in pVO2.

Secondary endpoints included the effect of CAMZYOS and placebo on postexercise LVOT peak gradient and the proportion of patients with improvement in NYHA class. Exploratory endpoints included the effect on Valsalva LVOT gradient and the proportion of patients with postexercise LVOT gradient <30 mmHg; all endpoints were assessed from baseline to Week 30.

EXPLORER-LTE Study Design3

The EXPLORER-LTE cohort is a part of MAVA-LTE, a single-arm, open-label, ongoing extension of the Phase 3 EXPLORER-HCM study to evaluate the long-term safety and efficacy of CAMZYOS, starting at 5 mg. 231 of 251 eligible patients from the EXPLORER-HCM trial enrolled in the long-term extension, after an 8-week washout period; the dose was periodically adjusted to optimize patient response, based on LVEF and Valsalva LVOT gradient. The majority of patients (92%) were on background therapy with a BB or CCB at baseline. The primary endpoint of the study was safety and tolerability.

EXPLORER-LTE Study Limitations

  • These LTE data are not included in the CAMZYOS US Full Prescribing Information and caution should be used in interpreting the data; there are limitations with the data including decreased sample size and different continuation rates based on the continued involvement of responders and attrition of nonresponders
  • MAVA-LTE, including the EXPLORER-LTE cohort (n=231), is a single-arm study without an active comparator, and data were not statistically tested for significance but are only descriptive in nature
  • Patients enrolled in EXPLORER-LTE were part of either the CAMZYOS or placebo arm in the EXPLORER-HCM study; therefore, baseline characteristics for EXPLORER-LTE changed due to time and the consolidation of both arms to one cohort

SCOUT-HCM: A 28-Week Pivotal Phase 3 Study in Pediatric Patients1,5,6

The efficacy and safety of CAMZYOS in patients 12 to 17 years of age was evaluated in SCOUT-HCM, an ongoing global, Phase 3, double-blind, randomized, placebo-controlled trial in adolescents with symptomatic NYHA Class II–III obstructive HCM, LVEF >60%, Valsalva LVOT gradient ≥30 mmHg, and maximal measured LVOT gradient ≥50 mmHg (resting, Valsalva, or postexercise). Patients were randomized in a 1:1 ratio to receive a starting dose of CAMZYOS (n=23) based on weight (2.5 mg in patients 35 to <45 kg; 5 mg in patients ≥45 kg) from available doses of 1 mg, 2.5 mg, 
5 mg, 10 mg, or 15 mg or placebo (n=21) once daily for 28 weeks. Evaluation for dose adjustment was allowed by 1 down titration at Weeks 4 and 8, or up 1 titration at Weeks 12 and 24 based on echocardiographic assessment of Valsalva LVOT gradient and LVEF. Concomitant beta blockers, calcium channel blockers, and disopyramide HCM therapies were allowed if patients had received a stable dose for ≥14 days prior to screening. The primary endpoint was the change from baseline in Valsalva LVOT gradient at Week 28.

Secondary endpoints (descriptive only; not powered for significance) included the changes in resting LVOT gradient, postexercise peak LVOT gradient, maximal wall thickness, E/e’, and HCMSQ-SoB; the proportion of patients achieving an increase in pVO2, an LVOT gradient (Resting or Valsalva) <30 mmHg, ≥1 NYHA class improvement, or a ≥1 MR grade improvement; and safety endpoints included a decrease in LVEF to <50%, and the change in the QT interval (calculated with Fridericia’s formula) from baseline to Week 28.

A crossover open-label active treatment period will begin after Week 28 and a long-term extension period will begin after Week 56.

SCOUT-HCM Study Limitations

An estimated 1:200–1:500 adults have obstructive HCM, and its prevalence in adolescents is estimated 3–9 per 100,000 children. This resulted in a small pool of study participants, thereby5,7,8

  • Limiting in-depth analysis of the secondary and exploratory endpoints
  • Precluding allowance for certain patient subgroups such as sex to be stratified for analyses
  • The ethnic diversity of the population was mostly white (68%)
  • The study did not evaluate patients younger than 12 years of age

CAMZYOS delivered significant improvements in both symptoms and obstruction in adults with symptomatic NYHA Class II–III obstructive HCM in EXPLORER-HCM. At Week 30, 2x as many patients on CAMZYOS achieved the primary composite endpoint of increased exercise capacity (pVO2) and saw improvement or no worsening in NYHA class vs placebo [CAMZYOS (37%; n=45/123), placebo (17%; n=22/128); difference (95% CI): 19% (9, 30); P=0.0005].1

  • Exploratory Endpoint: In EXPLORER-HCM, patients achieved reductions in mean provoked Valsalva LVOT gradient by the first clinical visit (Week 4)* that were sustained through Week 301,2  
    • Mean (SD) changes were -49 (34) mmHg for the CAMZYOS group and -12 (31) mmHg for the placebo group1
  • Secondary Endpoint: At Week 30, patients on CAMZYOS had a mean change in postexercise LVOT peak gradient of -47 mmHg vs
-10 mmHg with placebo (P<0.0001)1
  • Exploratory Endpoint: 57% of patients on CAMZYOS no longer had obstruction (postexercise LVOT gradient <30 mmHg) vs 7% of patients on placebo at Week 302
  • These prespecified exploratory endpoints were not powered for significance, and statistical comparisons have not been made
  • Secondary Endpoint: 65% of patients improved ≥1 NYHA class vs 31% on placebo (P<0.0001)1
  • Click here to explore the full data

*Week 4 marked the first scheduled assessment of LVOT gradient following the initiation of CAMZYOS.1

CAMZYOS results observed in EXPLORER-HCM were sustained at ~5 years (Week 252) in EXPLORER-LTE.1-3

  • CAMZYOS reduced Valsalva LVOT gradient at Week 30 in EXPLORER-HCM, with results sustained at ~5 years in EXPLORER-LTE. The mean (95% CI) change in Valsalva LVOT gradient at Week 252 was -56 (-60.8, -50.4) mmHg. 225 patients (97%) achieved a Valsalva LVOT gradient ≤30 mmHg at any point during the study1-4
  • In EXPLORER-HCM, 65% (80/123) of patients on CAMZYOS improved by ≥1 NYHA class vs 31% (40/128) on placebo at Week 30. This increased to 70% (128/184) of patients on CAMZYOS at ~5 years1-3
    • 50% (61/123) of patients on CAMZYOS vs 21% (27/128) of patients on placebo reached NYHA Class I (asymptomatic) at Week 30. This increased to 59% (109/184) of patients on CAMZYOS at ~5 years
    • 72 (39%) were NYHA Class II, and 3 (2%) were NYHA Class III
  • These prespecified exploratory endpoints were not powered for significance, and statistical comparisons have not been made

Click here to dive into the EXPLORER-HCM and EXPLORER-LTE data.

CAMZYOS delivered improvements in obstruction in pediatric patients aged 12 to 17 with symptomatic NYHA Class II–III obstructive HCM in SCOUT‑HCM. At Week 28, patients taking CAMZYOS had a mean (SD) reduction in Valsalva LVOT gradient -49.4 (42.6) mmHg vs. -1.8 (37.8) in the placebo group; LS mean difference of -48.0, 95% CI: -67.7, -28.3 (P<0.0001).5,9

The results for secondary and exploratory efficacy endpoints were summarized descriptively with estimates of between-group differences and were not adjusted for multiplicity and should not be interpreted as formal hypothesis testing.

Secondary endpoints included5,9:

  • Mean (SD) change in resting LVOT gradients from Baseline to Week 28 were -41 (35) mmHg in the CAMZYOS group and +5.3 (23) in the placebo group
  • LS mean change in postexercise LVOT gradient from baseline to Week 28: -31.2 mmHg (95% CI: −46.3 to −16.1) in postexercise LVOT gradient with CAMZYOS and 10.5 mmHg (95% CI: −5.5, 26.6) with placebo
  • A ≥1 improvement in NYHA functional class: 44% of CAMZYOS patients (n=10/23) achieved improvement, and 10% (n=2/21) of placebo patients (treatment difference: 34.0% [95% CI: 8.0, 56.3])

Exploratory endpoint: Change in NT-proBNP from baseline to Week 28: Relative change in NT-proBNP with CAMZYOS was a 77% greater reduction than placebo at Week 28. The proportion of the geometric mean ratio at Week 28 (relative to baseline) with CAMZYOS was 0.23 between the two groups (95% CI: 0.14, 0.37).5

Click here to learn more about the SCOUT-HCM data.

CAMZYOS REMS Data10

The FDA approved CAMZYOS in April 2022 with a REMS program in collaboration with BMS to ensure monitoring for heart failure due to systolic dysfunction. As this is not a clinical study, there was no required institutional review board approval. The data are based on submitted forms completed by HCPs and pharmacies and were focused on compliance with 4 key program elements:

  • HCP/pharmacy certifications and training
  • Patient enrollment and monitoring with echocardiograms
  • Screening for contraindicated concomitant medications and medications with drug interactions that require dosage adjustment
  • Ensuring that CAMZYOS dispensing occurred only when the previous 3 elements were completed and consistent with the REMS program

These outcomes are from REMS Assessment Reports provided to the FDA over a period of 34 months. The following are a summary of data from reports covering April 28, 2022, to February 27, 2025. There were 11,982 patients that received at least 1 dispense of CAMZYOS, and 11,007 patients had PSFs submitted as of February 27, 2025.

Data Limitations11

  • These single-arm data are not included in the US Full Prescribing Information for CAMZYOS; caution should be used in interpreting the data, as they were not statistically tested for significance but are descriptive in nature
  • REMS data collection is designed to demonstrate that the required safe use conditions have been met, and does not provide robust clinical data on safety, efficacy, or outcomes
  • Current data also do not provide exact values for various echocardiographic variables (eg, LVEF, Valsalva LVOT gradient), nor does it provide any information about potential confounding etiologies
  • The REMS program relies on individual providers making an accurate diagnosis of obstructive HCM prior to initiating CAMZYOS
  • There is a potential for underreporting:
    • It is possible that not all PSFs were submitted, and it is possible these patients experienced an unrelated decrease in LVEF, experienced an adverse event, potentially had insurance coverage issues, etc
    • The REMS program is designed to ensure that patients are eligible to continue therapy, and there is little incentive to report events that do not permit continued treatment with CAMZYOS

In a 34-month CAMZYOS REMS data capture of over 11,000 adult patients, reductions in Valsalva LVOT gradient were sustained over time, and real-world LVEF findings were consistent with CAMZYOS EXPLORER-HCM clinical trial experience.1,10

  • REMS data collection is designed to assess that the required safe use conditions have been met and does not provide robust clinical data on safety, efficacy, or outcomes. Provider discretion is advised. Results are not powered for significance

Click here for more details on the CAMZYOS REMS Program Data. 

At Week 30, mean (SD) changes in Valsalva LVOT gradient were -49 (34) mmHg for the CAMZYOS group and -12 (31) mmHg for the 
placebo group.1

In EXPLORER-HCM, reduction in mean Valsalva LVOT gradient was observed by the first clinical visit (Week 4)* and sustained through Week 30.1,2

This prespecified exploratory endpoint was not powered for significance, and statistical comparisons have not been made.

  • Patient response should be assessed as individualized (through LVEF and Valsalva LVOT gradient) and monitored via echo through scheduled follow-up1

*Week 4 marked the first scheduled assessment of LVOT gradient following the initiation of CAMZYOS.1

At Week 28, patients taking CAMZYOS had a mean (SD) reduction in Valsalva LVOT gradient: -49.4 (42.6) mmHg vs. -1.8 (37.8) in the placebo group; LS mean difference of -48.0, 95% CI: -67.7, -28.3 (P<0.0001).5,9

Patient response should be assessed as individualized (through LVEF and Valsalva LVOT gradient) and monitored via echo through scheduled follow-up.1

No head-to-head studies have been done, and cross-trial comparisons cannot be made. 

  • CMI trials should be interpreted within the context of each individual study and cannot be directly compared in the absence of head-to-head data due to differences including enrollment criteria, study design, patient population, and endpoints
  • For CAMZYOS, the evidence base includes the pivotal Phase III trial, EXPLORER-HCM, EXPLORER Long Term Extension Study, SCOUT-HCM, and REMS real-world data capture1-5,10

Safety Profile and Long-Term Experience

The CAMZYOS safety profile is supported by EXPLORER-HCM and is reinforced by long-term follow-up through ~5 years in EXPLORER-LTE.1,3

  • In EXPLORER-HCM, adverse reactions occurring in >5% of patients and more commonly with CAMZYOS than placebo were dizziness (27% vs 18%) and syncope (6% vs 2%); syncope (0.8%) was the only adverse reaction leading to discontinuation in patients receiving CAMZYOS1
  • Through Week 252, serious TEAEs of clinical interest occurred in 39 (16.9%) of patients
    • These events included LVEF <50% in 27 (11.7%) patients, atrial fibrillation in 14 (6.1%) patients, and atrial flutter in 1 (0.4%) patient

In SCOUT-HCM, CAMZYOS demonstrated a safety profile consistent with prior studies in adults.

No new adverse reactions were seen in adolescents receiving CAMZYOS.1,5

Click here for full safety information.

CAMZYOS targets hypercontractility in obstructive HCM and reduces cardiac contractility, so changes in LVEF can occur, which is why LVEF monitoring is built into treatment.1

  • CAMZYOS reduces LVEF and can cause heart failure due to systolic dysfunction. Following initiation, patients may develop heart failure while taking a cardiac myosin inhibitor like CAMZYOS. Regular LVEF and Valsalva LVOT gradient assessment is required for careful dose titration to achieve an appropriate target Valsalva LVOT gradient while maintaining LVEF ≥50% and to help avoid heart failure symptoms1
  • Echocardiogram assessments of LVEF and Valsalva LVOT gradient are required prior to and during treatment1
  • In EXPLORER-HCM in adults, mean LVEF remained above 60% at all trial visits, with results sustained  ~5 years2,3
  • LVEF reductions were reversible and affected a limited number of patients in EXPLORER-HCM; 7 (6%) patients in the CAMZYOS group and 2 (2%) patients in the placebo group experienced reversible reductions in LVEF <50% while on treatment, and all 7 CAMZYOS-treated patients recovered following interruption1
  • In EXPLORER-LTE through Week 252, 27 patients (11.7%) experienced reductions in LVEF <50%3
  • In the real-world dataset from the REMS Program, the rates of LVEF <50% were consistent with the data from the initial clinical trials of CAMZYOS1,10
  • In SCOUT-HCM, mean LVEF remained above 50% at all trial visits, up to 28 weeks5
  • Click here for more details on LVEF from the CAMZYOS REMS Program

As part of the CAMZYOS REMS program, every patient is assessed for DDIs and contraindications before starting and during treatment by prescribers and dispensing specialty pharmacists, providing opportunities for clinical interventions.1,10

  • In a recent ~3-year REMS analysis of >147,000 drug interaction and counseling checklists in adult patients, <1% of checklists identified drug interactions1,10

Click here for a review of DDIs and Contraindications with CAMZYOS.

Patients with a history of AFib were allowed to enroll in the EXPLORER-HCM trial.2

  • Patients with paroxysmal or intermittent AFib on screening ECG, and patients with persistent or permanent AFib not on anticoagulation for at least 4 weeks or not adequately rate-controlled within 6 months of screening were excluded from the trial2
  • At baseline, 10% of patients in the CAMZYOS group and 18% of patients in the placebo group had a history of AFib2
  • At Week 30, there were no differences in AFib events between the treatment groups (serious cardiac adverse events of AFib occurred in 2% of patients on CAMZYOS and 3% of patients on placebo; any AFib occurred in 6 patients (5%) in both the CAMZYOS and placebo groups)2
  • With prolonged CAMZYOS use at ~5 years, 14 patients (6.1%) in EXPLORER-LTE experienced AFib episodes, with new-onset AFib occurring at an exposure-adjusted incidence rate of 1.7 per 100 patient years3

Considering an incidence of AFib of ~2%–5% per year among patients with HCM, these rates are not higher than expected in the overall obstructive HCM patient population.12,13

In SCOUT-HCM, adolescent patients with AFib at screening were not enrolled in the trial.9

Adolescent patients with a cardiac arrhythmia precluding accurate echocardiographic assessment at screening (eg, persistent or permanent atrial fibrillation, frequent ectopic beats) were excluded from the SCOUT-HCM trial.9

Dosing and Monitoring

CAMZYOS dosing follows a predictable and manageable echo monitoring approach, guided by echocardiographic and clinical parameters to optimize efficacy while monitoring safety.1

  • In adults, treatment is initiated at 5 mg once daily, with titration to the appropriate dose (2.5 mg, 5 mg, 10 mg, or 15 mg) based on LVEF, Valsalva LVOT gradient, and clinical response1
  • In EXPLORER-HCM, 82% of adult patients completed the trial on 5 mg or 10 mg at Week 30 (based on LVEF, Valsalva LVOT gradient, and pharmacokinetics) within a relatively narrow and predictable dosing range1
    • 7% were receiving the 2.5 mg dose and 11% were receiving 15 mg at Week 301
  • In adolescents, dosing is based on weight. Once-daily treatment is initiated at 2.5 mg for patients weighing 30 kg to <45 kg, or 5 mg for patients ≥45 kg, with titration to the appropriate dose (1 mg, 2.5 mg, 5 mg, 10 mg, or 15 mg) based on LVEF, Valsalva LVOT gradient, and clinical response1
  • In SCOUT-HCM, 91% of the adolescent patients on CAMZYOS started on the 5 mg dose and by Week 24, ~70% of patients were on a ≥10 mg dose9
  • At Week 24, 4% of patients were taking 1 mg, 9% were on 2.5 mg, 17% were on 5 mg, 30% were on 10 mg, and 39% were on 15 mg9

For additional echo monitoring guidance, drug interaction, and dosing evaluation considerations, see the Interactive Dosing Guide or refer to the Dosing and Administration and Clinical Studies sections of the US Full Prescribing Information.

Unlike in adult patients, dosing in pediatric patients ≥30 kg is based on weight.

  • Once-daily treatment is initiated at 2.5 mg for patients weighing 30 kg to <45 kg, or 5 mg for patients ≥45 kg, with titration to the appropriate dose (1 mg, 2.5 mg, 5 mg, 10 mg, or 15 mg) based on LVEF, Valsalva LVOT gradient, and clinical response5
  • In pediatric patients who are on stable therapy with a moderate CYP2C19 inhibitor or a strong CYP3A4 inhibitor, initiate CAMZYOS at one dose level below the recommended starting dose: 2.5 mg for patients weighing 45 kg or more, or 1 mg for patients weighing 30 kg to less than 45 kg1
  • In SCOUT-HCM, 91% of the patients on CAMZYOS started on the 5 mg once-daily dose and by Week 24, ~70% of patients were on a ≥10 mg daily dose9
  • At Week 24, 4% of patients were taking 1 mg, 9% were on 2.5 mg, 17% were on 5 mg, 30% were on 10 mg, and 39% were on 15 mg9

CAMZYOS dosing follows a predictable and manageable echo monitoring approach, guided by echocardiographic and clinical parameters to target efficacy while monitoring safety.

For additional echo monitoring guidance and dosing evaluation considerations, see the Interactive Dosing Guide or refer to the Dosing and Administration and Clinical Studies sections of the US Full Prescribing Information.

In the initiation phase, echocardiograms are scheduled during Weeks 4, 8, and 12 per the dosing algorithm in the US Full Prescribing Information (Section 2). LVEF must be assessed before initiation; initiation or up-titration is not recommended if LVEF is <55%.1

In the maintenance phase (Week 12 or later), if the patient is stable with LVEF ≥55% and Valsalva LVOT gradient <30 mmHg, clinical status and echo are rechecked after 6 months and then every 6 months thereafter; check clinical status after 3 months during the first 6-month cycle. For additional Maintenance Phase scenarios, such as LVEF 50–<55% or LVEF ≥55% and Valsalva LVOT gradient ≥30 mmHg, consult the US Full Prescribing Information (Section 2, Figure 3). Additional echocardiograms may be needed after dosing changes, treatment interruption, or starting certain medications known to interact with CAMZYOS.1

If LVEF <50%, interrupt treatment and recheck echo parameters every 4 weeks until LVEF returns to at least 50%.1

Click here for more information about dosing.

The CAMZYOS Risk Evaluation and Mitigation Strategy (REMS) program is designed to help support closer care and monitor patient safety through LVEF echo monitoring for detection of heart failure and assessing for drug interactions. 

Click here for more information on CAMZYOS REMS.

Certification can be completed online at CAMZYOSREMS.com or by printing and faxing the HCP Enrollment Form to 833-299-9539, calling 833-628-7367, or emailing REMSSupport@bms.com.

  • To become certified, HCPs must review the CAMZYOS Prescribing Information, review the Program Overview, review the Education Program for Healthcare Providers and Pharmacies, successfully complete the Healthcare Provider Knowledge Assessment, and enroll by completing the Healthcare Provider Enrollment Form
  • HCPs will be notified within 1 business day if they have been certified to prescribe CAMZYOS

Prior to initiating treatment, confirm your patients eligibility and assess baseline clinical status1:

  • Confirm absence of pregnancy and use of effective contraception in females of reproductive potential
  • Assess LVEF by echo; do not initiate treatment in patients with LVEF <55%
  • Consider and assess for drug interactions prior to and throughout treatment

Start & Maintain patients on CAMZYOS with 3 steps:

  1. Enroll
  2. Prescribe
  3. Maintain and monitor

Your patients and practice must maintain the echocardiogram schedule to avoid unnecessary interruptions. If echocardiograms are not completed on time, the medication will not be dispensed.

Learn more about starting and maintaining patients on CAMZYOS here.

Access and Coverage

Once CAMZYOS has been prescribed, MyCAMZYOS can assist with Patient Access Support, Free Trial Program, Bridge Program, Co-Pay Assistance, and Echocardiogram Co-Pay Program if eligible. 

Click here for more support. 

You can enroll your patients in MyCAMZYOS at account.covermymeds.com or by calling 855-CAMZYOS (855-226-9967).

Once the patient is enrolled, the program will check the patient's insurance type and benefits. If the patient is deemed commercially insured, they may be eligible for the CAMZYOS Co-Pay Program and pay as little as $10 for a 30-day supply for their prescription. They may also be eligible for echocardiogram co-pay assistance and may pay as little as $0 in out-of-pocket costs per echocardiogram procedure, subject to an annual maximum benefit of $2500.

Patients are responsible for any costs that exceed the maximum benefit.

Commercially insured patients who experience a 5-day coverage determination delay may be eligible for the bridge program.


The patient will be provided CAMZYOS at no cost until coverage is received, a prior authorization is denied and not appealed, or for 18 dispenses, whichever is earlier.

General Questions

Traditional oral medication can be used to manage symptoms. Traditional treatment includes beta blockers, calcium channel blockers, and disopyramide. These medications are primarily used for symptom management of obstructive HCM, and are recommended treatment options by the AHA/ACC/MS Guideline. However, most are not approved by the FDA specifically for obstructive HCM, also known as oHCM.1,14

When the obstruction remains and symptoms persist with 1L pharmacologic medication (BB or CCB), CAMZYOS, as a CMI, is an AHA/ACC/MS Guideline–recommended treatment option (disopyramide is also Guideline-recommended after 1L treatment). Unlike most medications commonly prescribed for obstructive HCM, CAMZYOS is a CMI specifically designed to target hypercontractility, the source of obstructive HCM.1,14

Additionally, invasive procedures are an option for treating the obstruction. Alcohol septal ablation and septal myectomy, a type of surgery, can be performed (also known as septal reduction therapy). In removing the obstruction, these procedures may also result in symptom relief.1,14

Excess myosin-actin cross-bridge formation and dysregulation of the super-relaxed state are mechanistic hallmarks of HCM.1

CAMZYOS is an allosteric and reversible inhibitor selective for cardiac myosin. CAMZYOS modulates the number of myosin heads that can enter “on actin” (power-generating) states, thus reducing the probability of force-producing (systolic) and residual (diastolic) cross-bridge formation.1

CAMZYOS shifts the overall myosin population towards an energy-sparing, recruitable, super-relaxed state. In HCM patients, myosin inhibition with CAMZYOS reduces dynamic LVOT obstruction and improves cardiac filling pressures.1

Click here for more information.

If a dose is missed, it should be taken as soon as possible, and the next scheduled dose should be taken at the usual time the following day.1 

Exact timing of the dose during the day is not essential, but two doses should not be taken on the same day.1 

Swallow capsules whole. Do not break, open, or chew the capsules.1 

Click here for more information on CAMZYOS dosing.

1L=first line; ACC=American College of Cardiology; AFib=atrial fibrillation; AHA=American Heart Association; BB=beta blocker; CCB=calcium channel blocker; CI=confidence interval; CMI=cardiac myosin inhibitor; CYP=cytochrome P450; DDI=drug-drug interaction; E/e′=ratio between early mitral inflow velocity and mitral annular early diastolic velocity; ECG=electrocardiogram; echo=echocardiogram; FDA=US Food and Drug Administration; HCM=hypertrophic cardiomyopathy; HCMSQ-SoB=Hypertrophic Cardiomyopathy Symptom Questionnaire–Shortness-of-Breath domain score; HCP=healthcare provider; LS=least squares; LTE=long-term extension; LVEF=left ventricular ejection fraction; LVOT=left ventricular outflow tract; MR=mitral regurgitation; MS=multisociety; NT-proBNP=N-terminal pro–B-type natriuretic peptide; NYHA=New York Heart Association; oHCM=obstructive hypertrophic cardiomyopathy; PSF=patient status form; pVO2=peak oxygen consumption; REMS=Risk Evaluation and Mitigation Strategy; SD=standard deviation; TEAE=treatment-emergent adverse event.

References:

  1. CAMZYOS [package insert]. Princeton, NJ: Bristol-Myers Squibb Company; 2026. 
  2. Olivotto I, Oręziak A, Barriales-Villa R, et al. Mavacamten for treatment of symptomatic obstructive hypertrophic cardiomyopathy (EXPLORER-HCM): a randomised, double-blind, placebo-controlled, phase 3 trial. Lancet. 2020;396(10253):759-769. 
  3. Owens AT, Oręziak A, Masri A, et al. Safety and efficacy of treatment with mavacamten for up to 5 years in patients with obstructive hypertrophic cardiomyopathy: final results from MAVA-LTE. Oral presentation at ESC 2026; August 28-31, 2026; Munich, Germany.
  4. Garcia-Pavia P, Oręziak A, Masri A, et al. Long-term effect of mavacamten in obstructive hypertrophic cardiomyopathy. Eur Heart J. 2024;45(47):5071-5083. 
  5. Rossano JW, Canter C, Wolf CM, et al. Mavacamten in Adolescents with Obstructive Hypertrophic Cardiomyopathy. N Engl J Med. 2026;395(4):362-373.
  6. Rossano J, Canter C, Wolf C, et al. Mavacamten in symptomatic adolescent patients with obstructive hypertrophic cardiomyopathy: design of the phase 3 SCOUT-HCM trial. Am Heart J. 2026;292:107283.
  7. Semsarian C, Ingles J, Maron MS, Maron BJ. New perspectives on the prevalence of hypertrophic cardiomyopathy. J Am Coll Cardiol. 2015;65(12):1249-1254.
  8. Butzner M, ElHabr AK, Farajkhah K, et al. Epidemiology of Hypertrophic Cardiomyopathy in the United States From 2016 to 2023. JACC Adv. 2026;5(2):102552.
  9. Rossano JW, Canter C, Wolf CM, et al. Mavacamten in adolescents with obstructive hypertrophic cardiomyopathy. N Engl J Med. 2026;395(4):362-373 [supplementary appendix].
  10. Desai MY, Massera D, Seto D, et al. Mavacamten: real-world experience from 34 months of the Risk Evaluation and Mitigation Strategy (REMS) program. Presented at the American Heart Association Scientific Sessions. November 8-9, 2025. Poster MP1039. 
  11. Desai MY, Seto D, Cheung M, et al. Mavacamten: real-world experience from 22 months of the Risk Evaluation and Mitigation Strategy (REMS) program. Circ Heart Fail. 2025;18(1):e012441.
  12. Harper M, Mehra VC, Alsidawi S, et al. Effectiveness and safety of mavacamten in a cohort with high background prevalence of atrial fibrillation: real-world experience from MARVEL-HCM. Presented at ACC.26; March 28-30, 2026; New Orleans, LA. Poster 1395-234. 
  13. Rowin EJ, Maron MS, Chan RH, et al. Interaction of adverse disease related pathways in hypertrophic cardiomyopathy. Am J Cardiol. 2017;120(12):2256-2264.
  14. Ommen SR, Ho CY, Asif IM, et al. 2024 AHA/ACC/AMSSM/HRS/PACES/SCMR Guideline for the Management of Hypertrophic Cardiomyopathy: A Report of the American Heart Association/American College of Cardiology Joint Committee on Clinical Practice Guidelines. Circulation. 2024;149(23):e1239-e1311.


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