Each patient’s allergy drops are prescribed individually by their physician based on their symptom history, allergy test results, and region. So yes, the northwest patients typically are treated for different pollens than those in Tennessee valley, however, it is usually even more specific than that: one patient in the same region will likely have different sensitivities and thus a different prescription than another in the same region. This is why the treatment has to be individualized per patient.

Ah... thanks for the answer. I also did not know that the physician has to prescribe the plan. Makes sense now.