I have sinus and suffer with hayfever and allergies. My doctor has put me on AP Loratidine. It worked for a couple months but now it seems as if my body has become used to the medication. Ive tried codeine but have had terrible side effects. It seems most sinus meds contain codeine which I cannot take. I ve tried natural remedies but I guess the climate in South Africa does not help. My doc has prescribed AP Loratidine for me on a monthly basis. Is there any other kind of antihistamine that I can take?