For allergy sufferers, constant sneezing, runny noses and congestion can lead to misery. Fortunately, there are fast-acting medicines available that can alleviate allergy symptoms. The Online Drugstore has a large selection of allergy medicines from brands including Advil, Alka-Seltzer and Allegra. Antihistamines are good for controlling allergy symptoms as they block histamine, the chemical released by your immune system during the allergic reaction. Antihistamines are effective in easing runny noses, water eyes and sneezing but they do cause drowsiness. As a result, some allergy sufferers choose to take these medicines at night before bed as opposed to during the day while at work. There are allergy medicines touted as non-drowsy available so you do not need to endure allergic reactions all day to avoid drowsiness, and there are medicines that tout 12-hour and 24-hour relief. Thanks to these medicines, allergies do not have to be debilitating.