* Clinical and genetic diagnosis of FSHD1 or FSHD2
* Ability to walk independently at pre-specified walking speed (orthoses and ankle braces allowed) for at least 10 meters at screening
* Adequate muscle strength based on QMT composite score
Exclusion Criteria:
* Breastfeeding, pregnancy, or intent to become pregnant during the study
* Unwilling or unable to comply with contraceptive requirements
* Abnormal lab values, conditions or diseases that would make the participant unsuitable for the study
* Blood Pressure \> 140/90 mmHg at Screening
* Treatment with another investigational drug or biological agent within 1 month of Screening or 5 half-lives of the drug, whichever is longer
* Treatment with an oligonucleotide within 9 months of Screening
Avidity Biosciences, Inc. - medinfo@aviditybio.com
PHASE3
NCT07038200
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