Administration of Hydroxychloroquine (Plaquenil) to African Americans and Hispanics for the Treatment of Mild to Severe Ulcerative Colitis

This is a single arm study to evaluate the efficacy and immunological effect of administering Hydroxychloroquine to patients of non-European ancestry who have active mild to severe Ulcerative Colitis in spite of Mesalamine therapy. 10 Participants will be recruited in Icahn School of Medicine at Mount Sinai and 10 in Emory University (20 across all sites). Participants 18 years and above who identify as an individual of non-European ancestry with a diagnosis of Ulcerative Colitis will be approached for the study. Participants will be recruited from Mount Sinai IBD center prior to their standard of care endoscopy. Participants who meet the study's inclusion criteria i.e. If they currently have active disease, they will be able to receive the research medication. Participants will be administered 400mg hydroxychloroquine tablets orally for four months in addition to Mesalamine. Pre and post medication clinical, endoscopic and immunological assessments will be compared. Participants will also be followed up with bi-monthly phone calls. Participants will have a post medication colonoscopy at the end of the 4 month period. There is a risk of retinopathy and cardiomyopathy associated with long term use of the study drug at doses greater than 6.5mg/kg for more than 5 years. Participants will be screened for existing eye and heart disease and monitored pre and post medication for any new adverse effects.