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All you can do is keep up on Moms care and question. In Moms home the nurses told me of changes and why.
If a patient has an adverse reaction or an allergic reaction to a medication, a doctor will add that medication to the patient's list of allergies which is part of the medical records and the doctor does not need the patient's permission to do so. Also allergies are not really a subject that a doctor talks about with a patient unless a medication allergy interferes with what the doctor wants to prescribe for the patient.
Most of us don't think about allergies other than what medications can we take to relieve the symptoms especially if they are environmental or seasonal allergies.
We need more information about your Mom's situation. Are you asking if a doctor can state that your Mom is NO longer allergic to a certain medication or that she IS ALLERGIC to a certain medication? The doctor does NOT need the patient's nor the POA's approval or permission to state that a patient is allergic to a medication--it is a judgment call based on allergy testing or how the patient has responded to the medication in the past.