I have had perennial Rhinitis since 1988 - moved into a rented house while we looked for a country home - folk before us had had cats and started my allergy. I have to take a citirizene tablet (antihistamine)every day for the rest of my life. Otherwise I'd have solid brick along the front of my face across my nasal area, eyes bulging, and streaming, sneezing all over the place and generally feeling ill. Even if I am not near any cats if I forget a tablet I am in trouble after just 14 hours. It's as bada s any hay feever, but thank goodness my GP son-in-law found a pill that works for me.