Disease modifying anti rheumatic drugs.

DMARD's are medications that change the progression of inflammatory arthritis. That is where the "disease modifying" terminology comes from.

People with PMR take some of the same medications. However, they are taken more as "steroid sparing" medications in order to assist in keeping the steroid dose as low as possible. Medications like methotrexate, leflunomide, hydroxychloroquine and a few others are commonly tried after about 2 years of treatment with prednisone alone.
https://www.the-rheumatologist.org/article/study-most-patients-with-pmr-arent-getting-steroid-sparing-agents-in-first-2-years/
Prednisone alone treats the symptoms until PMR and/or GCA goes away. This is supposed to happen in 2 years but sometimes PMR/GCA lasts longer than 2 years.