Honestly, I don't really have the answer for allergy meds. OTC is allowed, but not all OTC especially if they are eventually going to become fliers. For example, AFRIN is a NO-NO because it is highly addictive.
Your best bet is to go to the help desk on DoDMERV that MullenLE set up prior to leaving this site.
P.S., traditionally from what I understand they are looking at the length and severity of the medical issue when it comes to allergies regarding DQ.