A Dose Regimen Study of BRM421 Ophthalmic Solution in Patients With Dry Eye Disease

Inclusion Criteria: * Are ≥18 years of age; * Are willing and able to comply with all study procedures and restrictions and the visit schedule; * Have a self-reported history of dry eye prior to enrollment; * If a woman of childbearing potential (WOCBP): are non-lactating, have a negative urine pregnancy test (UPT), and agree to use an acceptable form of contraception for the duration of the study; Exclusion Criteria: * Within 3 months prior to Visit 1, have participated in any other investigational study or used an investigational product or device; * Have any history of organ or bone marrow transplant, immunodeficiency disorder, human immunodeficiency virus, or hepatitis C, or any evidence of acute active hepatitis A (anti-hepatitis A virus immunoglobulin M); * Have any significant illness or condition that, in the opinion of the Investigator, could affect the study outcome measures. Such illnesses include (but are not limited to) Sjögren's syndrome, rheumatoid arthritis, systemic lupus erythematosus, severe cardiopulmonary disease, poorly controlled hypertension or diabetes, or drug/alcohol addiction; * Within 12 months prior to Visit 1, have undergone any ocular surgical procedure, including laser-assisted in situ keratomileusis (LASIK) or a similar corneal refractive surgery;