Eucalyptol 99% (Cienol 99%) is widely used in the pharmaceutical industry, used to produce cough medicine, cold medicine, wind oil, tickle oil, oils used for topical application, rolling, inhalation. Eucalyptol 99% is extracted mainly from Melaleuca essential oil. Eucalyptol 99% is mainly used in pharmaceuticals. The use of melaleuca essential oil for external use, such as massaging, bathing babies, treating insect bites, etc., should be used according to Vietnam Pharmacopoeia IV standards with quantitative content. Cienol in Melaleuca essential oil is not less than 40%.