My friend has dust allergy from last 2-3 years and whenever that happens she has running nose, cough, itching nose and other usual issues. She constantly has to use nasal spray during allergy. Earlier the allergy was less frequent but lately it has become a lot more frequent. She has tried treatment with various ENT specialists and consumed several types of antibiotics prescribed by doctors. What is the best cure for such dust allergies? I have seen a few friends taking homeopathic medication and gotten better overtime. How effective is homeopathic medicines for dust allergy? Can it be cured permanently?