Prescription medications are now and then just a stronger dose of the same substances. But some medicines contain different compounds. Atarax (hydroxyzine) and Allegra (fexofenadine) are 2 as a rule prescribed alternatives. In more excessive cases, physicians may suggest an oral corticosteroid such from the time when prednisone. ... read more
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"Food allergies since at times hard to perceive from mere food intolerance are real and affect millions. Eggs, peanuts and other foods commonly produce diarrhea or nausea in those sensitive to them."

Some are washable, others are not. Some are designed to last the lifetime of the device (usually 3-10 years), others will have to be replaced after 1-2 years or so. Prices vary considerably and the higher-priced models don't necessarily have lifetime HEPennsylvania filters.
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