the old fashioned "baldness" pill was one that blocked testosterone, so if you put it on your skin, age/testosterone baldness improved
but what if you are bald from an auto immune disease (alopecia aerata)?
Yes, an anti arthritis medicine works.
tofacitinib helped the guy with complete hair loss (alopecia totalis) from psoriasis...
we use immune supressors against severe psoriasis (i.e. methotrexate) so that makes sense.
the drug is being used for psoriasis, rheumatoid arthritis, and certain bowel disease.