The Allergies section sets a patient's allergies similarly to the Allergy Clinical TabWidget in MacPractice.
...
Tap the Allergies list header to list header to search for a new patient allergy from the Add Allergies menu. From the on screen keyboard, type at least three characters and tap the Search button. If the desired allergy is not a search result, the allergy will need to be added to the Allergies node within the Reference ability in MacPractice. If the correct allergy is found in the search, tap the allergy result to add it to the patient's Allergy list. With the allergy added to the patient's Allergies list, tap each field to set the Severity, Status, Identified Date, Reactions, and Notes.
...