Assist upper respiratory infections and ease asthma attacks. Eucalyptus oil’s anti-inflammatory, antiseptic, and anti-phlegm properties work very quickly to open congested airways. Make a steam inhalation by boiling two cups of water, pour it into a large bowl, then let it cool for five minutes. Add a drop or two of eucalyptus oil. Then create a tent from a small towel draped over your head. Place your face over the bowl and carefully breathe in the vapor until you get some relief. This should only take a couple of minutes. This is great for bronchitis, head colds, chest colds, and asthma.