it does take time for it to build up in your system. i'd give it a week, at least. i got really weird symptoms as my body adjusted to it. i was on allegra, 30mg twice a day, it wasn't strong enough for me but it helped. if you don't see any improvement then i'd go back to your doctor and maybe ask about zyrtec (worked wonders for my seasonal allergies.)
Singer,
Thanx. I'll give this prescription a shot and see if it works. If not, I'll try Claritan, which I believe we can get over the counter now, no? I'm mostly dealing with a lot of sneezing.