Study of How Dulaglutide Compares to Placebo in Participants With Type 2 Diabetes Who Are Also on Sulfonylurea Therapy (AWARD-8)

Inclusion Criteria:

• Type 2 diabetes mellitus
• Stable dose of sulfonylurea that is at least 50% of the maximum approved dose per the local label for at least 3 months prior to the first study visit
• Have an HbA1c value of ≥7.5% and ≤9.5%, as determined by the central laboratory draw performed at the first study visit
• Accept continued treatment with sulfonylurea therapy, throughout the trial, as required per protocol
• Men and nonpregnant women aged ≥18 years
• Stable weight (±5%) ≥3 months prior to screening
• Body Mass Index (BMI) ≤45 kilograms per square meter (kg/m^2)

Exclusion Criteria:

• Have type 1 diabetes mellitus
• Have been treated with ANY other antihyperglycemic medications (other than sulfonylurea) at the time of the first study visit or within 3 months prior to the first study visit
• Have used insulin therapy (outside of pregnancy) any time in the past 2 years, except for short-term treatment of acute conditions, and up to a maximum of 4 weeks; any insulin within 3 months prior to the first study visit is exclusionary
• Have been treated with drugs that promote weight loss within 3 months prior to the first study visit
• Are receiving chronic (>14 days) systemic glucocorticoid therapy or have received such therapy within the 4 weeks immediately prior to the first study visit
• Have had any of the following Cardiovascular (CV) conditions within 2 months prior to the first study visit: acute myocardial infarction, New York Heart Association Class III or Class IV heart failure, or cerebrovascular accident
• Have a known clinically significant gastric emptying abnormality (eg, severe diabetic gastroparesis or gastric outlet obstruction) or have undergone gastric bypass (bariatric) surgery or restrictive bariatric surgery
• Have acute or chronic hepatitis, signs and symptoms of any other liver disease, or alanine transaminase level >2.5 times the upper limit of normal
• Have a history of chronic pancreatitis or acute idiopathic pancreatitis, or were diagnosed with any type of acute pancreatitis within the 3 month period prior to the first study visit
• Have an estimated glomerular filtration rate [eGFR] <30 milliliter per minute per 1.73 square meter (mL/min/1.73 m^2), calculated using the Chronic Kidney Disease Epidemiology Collaboration [CKD-EPI] equation as determined by the central laboratory at the first study visit
• Have any self or family history of type 2A or type 2B multiple endocrine neoplasia (MEN 2A or 2B) in the absence of known C-cell hyperplasia (this exclusion includes those participants with a family history of MEN 2A or 2B, whose family history for the syndrome is Rearranged during Transfection (RET) negative; the only exception for this exclusion will be for participants whose family members with MEN 2A or 2B have a known RET mutation and the potential participant for the study is negative for that RET mutation)
• Have any self or family history of medullary C-cell hyperplasia, focal hyperplasia, carcinoma (including sporadic, familial or part of MEN 2A or 2B syndrome)
• Have a serum calcitonin ≥20 picogram per milliliter (pg/mL) as determined by the central laboratory at the first study visit