It is used as an anti-septic and deodorant externally for common cold, fever and headache. It is inhaled with steam which relieve cough in chronic bronchitis and asthma. It can also used as joint pain reliever and it has many medicinal benefits. In the product, no expiry date is mentioned, you can see the pictures of the details mentioned on it.You can use the oil as long as you want because it is an original eucalyptus oil. I brought this oil from a shop in Ooty. I have used the product for 2-3 times and you can see how much I used it. I'm selling it because I don't use oil much. Quantity - 60 ml