Springtime can be rough on allergy sufferers but so can autumn since that's when ragweed (one of the most common plant allergens) starts to release its pollen. Relieve your hay fever and allergy symptoms, such as runny nose, sneezing, itchy, watery eyes, itchy nose or itchy throat, with fexofenadine hydrogen chloride. Fexofenadine starts working in 1 hour and won't leave you feeling drowsy.