Botanical Overview
Madagascar Periwinkle (Catharanthus roseus) is a flowering plant in the Apocynaceae family. Traditional medicine systems have documented several valuable applications for this species, supported by its observed therapeutic effects. The dogbane family (Apocynaceae) includes herbs, shrubs, vines, and trees with milky sap containing alkaloids and cardiac glycosides. The flowers are typically five-petaled and often showy with a tubular corolla. Many species in this family are highly toxic but also source of important cardiac medications.
General Description
It is native and endemic to Madagascar, but is grown elsewhere as an ornamental and medicinal plant, and now has a pantropical distribution. It is a source of the drugs vincristine and vinblastine, used to treat cancer. It was formerly included in the genus Vinca as Vinca rosea. It has many vernacular names among which are arivotaombelona or rivotambelona, tonga, tongatse or trongatse, tsimatiririnina, and vonenina.
Family Context
The Apocynaceae family is primarily tropical and subtropical. Notable medicinal members include:
- Alstonia scholaris — 42 documented uses
- Oleander — 30 documented uses
- African Snakeroot — 28 documented uses
- Periwinkle — 27 documented uses
Geographic Distribution
Madagascar Periwinkle has been recorded in 10 countries and territories worldwide, including Australia, Brazil, Colombia, Hong Kong, Indonesia, and others.
Traditional Uses
Madagascar Periwinkle has been traditionally used for digestive health, respiratory conditions, and nervous system disorders, among other applications.
Digestive health.
- Purgative
- Vermifuge
For digestive complaints, the herb is typically prepared as a tea or decoction taken before meals. The bitter compounds stimulate digestive secretions and improve nutrient absorption. Some traditions use the powdered root or leaves in small doses as a stomachic tonic.
Respiratory conditions.
- Catarrh
- Cold
Respiratory conditions are addressed through steam inhalation of the herb’s vapors or internal use as a warm tea. The hot infusion acts as an expectorant, helping to loosen phlegm and clear congestion. Some traditions combine it with honey for coughs.
Nervous system disorders.
- Sedative
Nervous system support involves taking the herb as a warm tea, often in the evening or before bed. The calming compounds interact with neurotransmitter systems to promote relaxation and restful sleep.
Active Compounds
Phytochemical research has identified 30 compounds in this species, including a diverse array of phytochemical classes (see the Complete Chemical Inventory below for the full list).
The identified compounds include the following categories:
- Sterol: cholesterol-like compounds with anti-inflammatory properties
- Alkaloid: nitrogenous compounds with diverse pharmacological activities