Hi Practo doctors & team, I am facing sneezing problem whenever I went outside and I always have runny nose. As per me it's because of dust and smoke present in the air but am not sure. Due to this, I am not able to concentrate on anything. Whenever I take avil 50 mg tablet this problem doesn't happen but whenever I don't take this, problem becomes severe and makes  me to sneeze throughout the whole day. I have visited a local doctor and he prescribed Avil 50 mg 15s tablet assuming it's an allergic reaction but I don't know how long I need to take this medicine. Could you please tell me what exactly check and tests does it requires and what to do further.