UGT1A1 is a gene. This site has 31 published variants inside it, each from a published genetic study, joining it to 3 condition pages and 3 drug pages.
CPIC, the international group that writes gene-based prescribing guidelines, rates how strong the evidence is for each gene and medicine, from A (strong enough to change the prescription) to D (weak or conflicting). Every rating is shown, the weak ones included, so you can see where the evidence stops.
Source: CPIC (Clinical Pharmacogenetics Implementation Consortium), public domain (CC0), copy kept on this site and refreshed weekly.
The FDA keeps a list of medicine labels that mention a gene. These are the ones that name UGT1A1. Where this site has a page on the medicine, the name links to it; otherwise it opens the label on DailyMed. A label naming a gene does not always mean a test or a dose change: for many it is one line about how the body clears the drug.
Source: FDA Table of Pharmacogenomic Biomarkers in Drug Labeling, current as of 12 August 2026.
See UGT1A1 with everything it connects to on the Gene Knowledge Graph, or as data at /api/v1/genes/UGT1A1.
Licensed CC BY-NC 4.0: free to read, share and adapt for non-commercial use, naming MyGeneLog™ and linking the exact page. Commercial use, including training or serving a commercial AI system, needs a licence — https://www.mygenelog.com/license
UGT1A1 gene. MyGeneLog™. https://www.mygenelog.com/genes/UGT1A1
A gene page gathers published research; it is not a test result and not medical advice. If a gene matters to your health, talk to a doctor or a genetic counsellor.