noun, feminine/ˌdosis de su ˌpɾopja mediˈθina/plural: dosis de sus propias medicinas
a taste of one's own medicine
“Le da una dosis de su propia medicina, y se siente bien por haberlo hecho.” — He gives them a taste of their own medicine, and he feels good about doing it.
Literally, “dose of one's own medicine”.