Eucalyptus is an aromatic herb that stimulates the system, a decongestant and expectorant that relaxes spasms and lowers fever. It also has antibiotic properties.
The leave extract (NOT the essential oil) has shown some diuretic, anti-diabetic and anti-tumor properties, and the leaves can be used as a herbal tea.
Eucalyptus is most commonly used externally as an inhalation and vapor rub, to treat and relieve mucus congestion. It clears the chest, helps bronchitis, sinusitis, colds and 'flu.
Also used as a liniment for bruises, sprains and various muscular pains.
Ointments are also manufactured, with eucalyptus as an ingredient, to treat wounds and abscesses.