Hi, I have gone through your query and understand your concern. Brief answer: I presume that your physician made his best possible diagnosis and prescribed accordingly. No, Azithral has no direct effect for dust allergy. Detailed answer: If I were the treating physician, I would look for few queries: • Do you have nasal blockage, nasal irritation? • Do you have known allergy other than dust? • Do you have breathlessness, wheeze or chest tightness? Then I would perform some physical examination specially nose and chest. So that I could establish the diagnosis of allergic rhinitis and to exclude asthma. If I thought of rhinitis, I would advice: • Avoid triggers ,example: dust • Wash nasal cavity with normal saline or water • Oral antihistamine • Steroid nasal spray Since this is a prescription medicine, I would suggest you to meet the local Doctor to confirm the diagnosis. Hope this helps you. If you have further questions or follow up queries, please feel easy to ask us. Take care.