I was excited to find two new products at Costco: an OTC Allegra two-pack and ultra-delicious red grapefruit sections in convenient take-along cups. Unfortunately, I soon discovered that the two are incompatible since grapefruit (and other citrus juices) cut the effectiveness of Allegra in half. My solution? Have the grapefruit for breakfast; take the Allegra in mid-afternoon. So far, so good...but the pollen assault is just beginning.