no mate, it's fine for a while. We used to have a cat when I was little, and I was fine then, but I found I was allergic to them soon after meeting my wife - I went round to her parents' house for the first and last time without antihistamines!
But don't get me wrong, I absolutely love them :) The allergic reaction typically takes about an hour to kick in, depending on how much fur is on the carpet and how much I stroke the cat :)
Roo
PS I'll bring pills :)