depend on cost difference, primatene may be better (do math). 1. some say the hcl provide smidge more eph than sulfate. 2. primatene have 30 doses at 25mg - bronkaid only have 24 doses. primatene where i at is only about $10.xx/box. limit where i at (state law) is 3g total eph per day, not to exceed 9g total in month. that equal something like 4 boxes, 3 days in a row if wanted. BUT - i think store not follow law (guess they can be more restrictive if want, i not lawyer) as once tried 3 boxes and denied, only 2 allowed.