“It’s time-out!” yelled Bagman’s voice, “as trained mediwizards hurry onto the field to examine Aidan Lynch!” -- Ludo Bagman (GF8)
Not known if this is distinct from healing, analogous to the difference between a physician and a paramedic; if it is distinct, mediwizard might be analogous to a paramedic, judging from the World Cup (GF8).
It is unknown what mediwizards use to help/revive people. However, at the 1994 Quidditch World Cup, mediwizards used potion to help revive Irish National Quidditch player, Aidan Lynch: "He was now circling high above Lynch, who was being revived by mediwizards with cups of potion" (GF8).
At the 1994 Quidditch World Cup, mediwizards used "cups of potion" to revive Aidan Lynch (GF8). It is unknown what kind of potion this was.