Histamines are released into your body when you have an allergic reaction to hay fever. Antihistamines are used to counteract these reactions and symptoms so you can function as a human rather than the monster or zombie you become under the influence of histamines. You can find these histamine fighters nearly any place with a pharmacy or over-the-counter medications. This might be a gas station, supermarket, or general retail store. Individuals with more severe reactions can get antihistamines recommended by their doctor rather than over-the-counter options with lower dosages. If you know you are going to be in a trigger zone, whether it be in a dusty house or a pollen-filled park, try to take medication at least thirty minutes before exposure.