Many oral allergy (OTC) meds have some illegals. Allegra seems to have less illegals than some others.
Some people have reported to find some relief with non-oral meds like flonase. Others have reported that allergy symptoms were reduced by limiting SCD legal dairy when symptoms were at their worse.
When it comes to medications Elaine did write that if meds are required and there are no fully legal alternatives then whatever is needed should be used.