In eucalyptus, too, it is the essential oils that are used against a cold and cough. The cineole, which is contained in the eucalyptus leaves, loosens the stubborn mucus from the bronchi and paranasal sinuses and promotes its evacuation. This makes it easier to cough up. The vapors of eucalyptus oil are very effective. For this purpose, one or two drops of eucalyptus oil are added to the bowl and the oil is poured over a liter of boiling hot water. With a towel over the head, the fumes are inhaled up to three times a day. Breathe in and out calmly.