My allergies were pretty bad, so I started buying a generic version of Claritin and got a prescription for Flonase (though I usually just get the cheaper generic version; nasalcort). After a few months, you build up a "tolerance" to the SPECIFIC animals you live with (you're get resistant to Mr. Tickles, your classic tabby, but not Pinky, your girlfriends classic tabby). I still need the claritin daily. If I go off for two or three days I start getting a runny nose and itchy eyes. I don't need the Flonase anymore for my cat alergies, but I got a refill because my fall allergies are starting to kick in.