This study is focused on evaluating the safety of a new drug named LY3981314 when given to healthy individuals. The drug is administered through an injection under the skin. Researchers are interested in understanding how the drug is processed in the body, which includes studying how it is absorbed, distributed, and eventually removed from the body. This research is crucial as it helps determine whether LY3981314 is safe enough to be used in future studies involving patients who may benefit from this medication. Participants in this study will receive single doses of the drug, and their health will be monitored over approximately 25 weeks, with the possibility of an extension to 49 weeks. This involves regular check-ups and tests to observe how the body reacts to the drug and ensure there are no adverse effects. Although there are no specified primary outcomes mentioned, the study's focus is on safety and understanding how the drug behaves in the human body. The information gathered will be valuable for guiding further research and development of LY3981314.
Inclusion Criteria: * Are overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, vital signs, and 12-lead electrocardiogram (ECG) * Individuals assigned male at birth who agree to follow contraceptive requirements, or individuals assigned female at birth and not of childbearing potential * Have venous access sufficient to allow for blood sampling * Have a body weight within 45 to 145 kilograms (kg) and body mass index within the range of 18.5 to 35 kilogram per square meter (kg/m²) (inclusive) * For Part B: * Japanese participants must be first-generation Japanese, defined as the participant, the participant's biological parents, and all of the participant's biological grandparents being of exclusive Japanese descent and born in Japan * To qualify as Chinese for this study, all 4 of the participant's biological grandparents must be of exclusive Chinese descent and born in China Exclusion Criteria: * Have known allergies to LY3981314, related compounds, or any components of the formulation * Have a significant history of or current rheumatologic, cardiovascular, respiratory, renal, gastrointestinal, endocrine (such as Cushing syndrome, hyperaldosteronism), hematological, or neurological disorders capable of significantly altering the absorption, metabolism, or elimination of drugs; of constituting a risk when taking the investigational medicinal product; or of interfering with the interpretation of data * Have received at least 1 live vaccine within 28 days of screening, or intend to do so during the study, or within 28 days after the study * Had any surgical procedure (except for minor surgery requiring local or no anesthesia and without any complications or sequelae) within 12 weeks prior to screening, or intend to do so during the study, or within 28 days after the study * Show evidence of active or latent tuberculosis (TB) * Have used, or intend to use, prescription or nonprescription medication within 14 days prior to dosing (or 5 half-lives - whichever is longer) * Have a diagnosis or history of malignant disease * Have a history of a primary immunodeficiency, splenectomy, or any underlying condition that predisposes the participant to infection that, in the opinion of the sponsor or investigator, poses an unacceptable risk to the participant * Have had any significant infections within 3 months prior to the screening visit or develop any of these infections before the randomization visit * Have used, or intend to use, prescription or nonprescription medication within 14 days prior to dosing (or 5 half-lives - whichever is longer) * Have participated in a clinical study involving an investigational product within the last 30 days of the final drug administration (or 5 half-lives, whichever is longer) * Have donated 500 milliliters (mL) of blood or more or participated in a clinical study that required a blood volume of at least 500 mL, within the past 3 months
are designated in this study
of being blinded to the placebo group