As mentioned before, the major constituent of eucalyptus is cineole (or eucalyptol) which when exposed to the air turns into crystalized resin. This key chemical provides most of the plant's beneficial effects. Flavonoids (rutin, hyperoside, and eucalyptin), and polyphenoic acids (caffeic, gallic, ferulic etc) are also found in the plant's chemical content. They provide anti-microbial, expectorant, anti-spasmodic, and stimulant actions.
For many years the antiseptic properties of eucalyptus oil have been known to the traditional and alternative medicine. It has been noticed, that the older the oil gets - the better it is, since more ozone in it is formed to provide disinfecting actions.
The medicinal preparation from the plant are used both internally and as topical applications. Applied locally, the oil serves as a stimulant to cardiac function and arthritis. Also, it is used as a component for the antiseptic gargle effective for spasmodic throat conditions.
Eucalyptus mouthwash relieves the symptoms of the dental plaque and gingivitis. Anti-inflammatory and mucolytic action of the oil makes it potent in treating respiratory diseases, such as bronchial catarrh, laryngitis, pulmonary tuberculosis and asthma symptoms.
Being a diuretic, eucalyptus stimulates bladder, clears urine out of mucous and relieves pain associated with relevant conditions. Commonly known eucalyptus-based aromatherapy is aimed at relieving the symptoms of various health troubles. They include pain, headache, depression, and insomnia. In addition, eucalyptus honey produced from the flower pollen has shown some successful results too. It proved to be helpful in treating parasitic conditions, fever, and catarrh diseases.