I prolonged the life of my terminally ill dog using EPO. It wasn't exotic or expensive. Probably that means it's already in wide use for humans, too.

Yes, EPO is a normal drug used to treat certain disorders affecting blood formation, or to trigger increased blood formation before donations or operations.

Medication for human use has been availabe in various forms and brand names since before 1990, as Epogen, NeoRecormon, Eprex and lots of other names.