• Written informed consent has been obtained prior to initiating any study-specific procedures.

• Willingness and ability to comply with the study procedures and visit schedules and ability to follow verbal and written instructions, including eDiary questionnaire completion requirements.

• Subjects 50 to 80 years of age, inclusive, on the day of consent.

• Body Mass Index (BMI) ≤40 kg/m2.

• Symptoms (including pain) associated with OA of the index shoulder for ≥3 months prior to Screening Visit (subject self-report is acceptable).

• Shoulder pain due to OA for \>15 days over the last month (as reported by the subject).

• Grade 2 or 3 OA in the index glenohumeral joint based on the Samilson-Prieto classification system as confirmed by X-ray (axillary view and true anterior-posterior view) taken at, or within 6 months of, the Screening Visit and read by the central reader.

• Average daily mean pain score ≥4.0 and ≤9.0 in index shoulder (0-10 numeric rating scale \[NRS\]) using the average daily ratings for at least 4 out of the 7 days prior to Baseline/Day 1.

• Average Shoulder Pain and Disability Index (SPADI) pain score ≥5.0 and ≤9.0 in index shoulder prior to Baseline/Day 1.

⁃ Willingness to abstain from use of protocol-specified restricted medications and therapies during the study.

⁃ Sexually active males or females of childbearing potential must agree to use a highly effective method of contraception throughout the duration of the study. Females of childbearing potential are defined as females who are not surgically sterile or postmenopausal (defined as 12 consecutive months with no menses without an alternative medical cause) as documented in medical history. Highly effective methods of contraception include abstinence; oral, injected, or implanted hormonal methods of contraception; intrauterine device or intrauterine system; condom or occlusive cap (diaphragm or cervical/vault caps) with spermicidal foam/gel/film/cream/suppository; or monogamous intercourse with a partner who is surgically sterile (post-vasectomy, -hysterectomy, or -tubal ligation).