The Effect of Retatrutide Once Weekly on Cardiovascular Outcomes and Kidney Outcomes in Adults Living With Obesity (TRIUMPH-Outcomes)

The main purpose of this study is to determine if retatrutide can significantly lower the incidence of serious heart-related complications or prevent the worsening of kidney function. The trial will enroll adults with body mass index 27 kg/m\^2 or higher and Atherosclerotic Cardiovascular Disease and/or chronic kidney disease. The study will last for about 5 years. Participants will have up to 27 clinic visits with the study doctor.

Inclusion Criteria: * Participants may be without type 2 diabetes (T2D), or with T2D if their hemoglobin A1c (HbA1c) is 10% or lower * Participants have established atherosclerotic cardiovascular disease (ASCVD) and/or chronic kidney disease (CKD), as evidenced at least one of the following: * Coronary artery disease * Cerebrovascular disease * Peripheral arterial disease * Chronic kidney disease defined as: * eGFR \30 milligram/gram (mg/g) (0.030 mg/mg) * eGFR \100 mg/g (0.100 mg/mg), or * eGFR \300 mg/g (0.300 mg/mg) (eGFR is calculated by central lab based on Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) creatinine-cystatin c equation as determined by central lab) * A Body Mass Index of ≥27.0 kilograms per meter squared (kg/m\^2) Exclusion Criteria: Diabetes related: * Participants have Type 1 Diabetes or any history of diabetic ketoacidosis CV related: * Participants have any of the following cardiovascular conditions ≤ 90 days prior to randomization: * Myocardial infarction * Acute coronary syndrome * Stroke, or * Coronary, peripheral, or carotid artery arterial revascularization procedure. * Have acute decompensated heart failure requiring hospitalization. * Have New York Heart Association (NYHA) Classification Class IV heart failure at screening Kidney related: * Participants have an eGFR \5000 mg/g (5.000 mg/mg) at screening * Have received any form of dialysis ≤ 90 days from the date of randomization * Have either undergone a kidney transplant or have a transplant procedure scheduled Other medical conditions: * Participants have had or plan to have a surgical treatment for obesity, * Have a history of chronic or acute pancreatitis * Have a family or personal history of medullary thyroid carcinoma or multiple endocrine neoplasia (MEN) syndrome type 2 * Have a known clinically significant gastric emptying abnormality, such as severe gastroparesis or gastric outlet obstruction