Have an abnormality in the 12-lead electrocardiogram (ECG), vital signs, or both

Have had symptomatic herpes zoster within 3 months prior to screening

Have a known allergy or hypersensitivity to levocetirizine

Intend to use prescription or nonprescription medication within 14 days or 5 half-lives prior to dosing

Have received treatment with biologic agents within 3 months or 5 half-lives prior to dosing

Smoke more than 10 cigarettes or other tobacco products per day before study entry

Are pregnant or breastfeeding, or intend to become pregnant or breastfeed during the study

A Phase I Study of LY3471851 in Healthy Participants