Do not take internally. Possible central nervous system depression along with ataxia and drowsiness. Possible stomatitis, vomiting, diarrhoea and gastrointestinal irritation when taken orallyThe trees also have medicinal uses. Melaleuca tea tree uses center around the essential oil obtained from the leaves and twigs. Herbalists consider tea tree oil an important natural antiseptic. The oil can be used for treating stings, burns, wounds and skin infections. It is said to stimulate the immune system and serves as an effective treatment against both bacterial and fungal infections. The essential oil is also used in aromatherapy.