A Study to Investigate Effectiveness of Tirzepatide Following Initiation of Ixekizumab in Participants With Active Psoriatic Arthritis and Overweight or Obesity in Clinical Practice (TOGETHER AMPLIFY-PsA)

Who May Qualify: - Have a diagnosis of active psoriatic arthritis (PsA) as defined by a rheumatologist or other healthcare professional (HCP) experienced in treating PsA. - Body Mass Index (BMI) of 30 kilograms per meter squared (kg/m²) or greater (obesity) or 27 kg/m2 to \<30 kg/m² (overweight) in the presence of at least 1 weight-related comorbid condition (hypertension, dyslipidemia, type 2 diabetes, obstructive sleep apnea, or cardiovascular disease). - Who have been treated with ixekizumab for approximately 3 months (±1 month) prior to decision to add tirzepatide. - Must be able to initiate tirzepatide (Day 0) within 30 days of treatment decision (baseline or screening). Who Should NOT Join This Trial: - Have currently received ixekizumab for more than 4 months or less than 2 months. - Had any exposure to tirzepatide or other glucagon-like peptide-1 (GLP-1) receptor agonist (for example, dulaglutide, liraglutide, or semaglutide). - Are currently enrolled in any other clinical study. - Have a known hypersensitivity to any component of tirzepatide. - Have a personal or family history of medullary thyroid cancer. - Have multiple endocrine neoplasia type 2. - Have type 1 diabetes mellitus. - Have a history of chronic or acute pancreatitis at any time before screening. - Have a history of proliferative diabetic retinopathy, diabetic maculopathy, or nonproliferative diabetic retinopathy that requires acute treatment. - Have a history of ketoacidosis or hyperosmolar state/coma. - Have a history of severe hypoglycemia unawareness within the 6 months before screening. - Have a history of severe gastrointestinal complications, including gastroparesis, gastroesophageal reflux disease, dyspepsia, chronic nausea/vomiting. Always talk to your doctor about whether this trial is right for you.