Why Was I Prescribed Cyvax Instead Of Seretide For My Spring Allergies And Shortness Of Breath?

Hello doctor , i have an allergy in this period every year spring , sometimes i get shortness of breath only in this period of year my doctor used to give me seretide this time he gave me Cyvax which i don t think is the good medicament for me (i didn t use it yet i hope you give me a good explanation)