Olumiant for hair loss, known generically as baricitinib, is a medication used to treat certain types of skin diseases and inflammatory conditions, such as alopecia areata.
It belongs to a class of drugs called JAK inhibitors, which work by blocking the activity of certain enzymes in the immune system. Olumiant has been approved by the US Food and Drug Administration (FDA) for the treatment of alopecia areata in adults who have at least 50% scalp hair loss.