What antibiotics did they use in World War 2?

They used Penicillin, Sulfanilamide (Sulfa), and Atabrine.

I'm sure they used other Antibiotics, but these are the main three. (Atabrine was mainly used in the South Pacific).

Soldiers carried Sulfa with them to prevent infections, Atabrine was used to stop malaria though it had a lot of negative side effects, and Penicillin was mas produced by the Pfizer company, and saved countless lives during WWII.