A0.75: asthma with and without pretreatment of 0.75 mg

What does A0.75 mean? The above is one of A0.75 meanings. It may have other definitions. Please refer to the end of this passage.

A0.75: asthma with and without pretreatment of 0.75 mg

Definition in English: asthma with and without pretreatment of 0.75 mg