The tropical shrub that triggers your body to move
In short: Known for its yellow flowers and medicinal power, senna is a staple stimulant laxative. While it effectively treats constipation by triggering bowel muscle contractions, this plant's utility extends from ancient medicine to ornamental gardening and even leather production.
Senna is a genus of flowering plants within the pea family, Fabaceae. Most species are shrubs or small trees found in subtropical and tropical regions, though some grow in temperate zones. The name itself is derived from the Arabic word sanā, which describes plants possessing cathartic and laxative properties. The type species for this genus is Senna alexandrina. Approximately fifty species are currently grown in cultivation.
In medicine, senna acts as a stimulant laxative. It works by triggering the muscles in your bowel to push waste out, making it an effective treatment for constipation, such as when stools are hard or infrequent. It is typically taken once a day, often in the evening, with effects appearing in approximately 8 to 12 hours. It is generally safe for most adults and children over twelve. However, those under twelve should only use it if a doctor prescribes it.
While widely used, senna requires careful administration. It should not be used for more than seven consecutive days without medical advice. Potential side effects include stomach pain, cramps, and diarrhea. In rare cases, serious issues can arise, such as low potassium levels in the blood—which can lead to heart rhythm problems—or allergic reactions like anaphylaxis. If you experience symptoms like vomiting or dizziness after taking it, consult a pharmacist immediately. You should also avoid consuming anything containing liquorice root while using this medicine.
Beyond the medicine cabinet, senna species serve diverse roles. Some varieties are grown as ornamentals due to their showy yellow flowers, while others are used to produce tanbark for leather preparation. The genus is taxonomically complex, with estimates suggesting between 260 and 350 different species exist. Certain caterpillars, such as the black witch, rely on these plants for food.
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Sources
- Summary by Intellect · source: Senna: a laxative medicine to treat constipation
- Also: Senna | Description, Species, Cultivation, Uses, & Facts | Britannica
- Also: Senna (plant)
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