What does digitoxin mean?
Digitoxin is a powerful cardiac glycoside — a naturally occurring compound extracted from the dried leaves of the common foxglove, Digitalis purpurea. Like its better-known cousin digoxin, it works by strengthening the contraction of the heart muscle while slowing the heart rate, which makes it valuable in treating congestive heart failure and certain rhythm disturbances. Digitoxin is unusual among cardiac glycosides for its very long half-life: it binds strongly to proteins in the blood and lingers in the body for days, so dosing must be managed with great care and blood levels monitored to avoid toxicity. Indeed, the margin between a therapeutic and a poisonous dose is narrow — symptoms of excess range from nausea and visual disturbances to dangerous arrhythmias. The word itself derives from the genus name Digitalis, ultimately rooted in the Latin digitus, meaning finger, a reference to the flower's thimble-shaped blossoms.
nounA potent cardiac glycoside obtained from the leaves of the common foxglove (Digitalis purpurea), used in medicine to treat heart failure and to control the heart rate in certain arrhythmias.
- A crystalline cardiac glycoside extracted from Digitalis purpurea that strengthens heart muscle contractions and slows the heart rate, used clinically in congestive heart failure and certain arrhythmias.
"The cardiologist prescribed a low maintenance dose of digitoxin to steady the patient's failing heart."
"Serum digitoxin levels must be monitored carefully because the drug accumulates in the body over time."
"Before modern diuretics were available, physicians relied on foxglove-derived drugs such as digitoxin to manage dropsy."
Rarely pluralized; the plural appears mainly in laboratory contexts referring to distinct measured samples or formulations.
"The assay compared digitoxins extracted from different batches of foxglove leaf."
Digitoxin is literally named after the foxglove's Latin botanical name — a flower that can heal your heart or stop it, depending on the dose.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of digitoxin
Digitoxin was coined in the nineteenth century from Digitalis, the botanical genus name of the purple foxglove, combined with the chemical suffix -in used for isolated substances. The genus name Digitalis itself traces back to the Latin digitus, meaning finger or toe, chosen by early botanists because the foxglove's tubular flowers resemble the thimbles once worn on fingers. It thus shares its root with words like digital and digitate.
How digitoxin is actually used
Strictly technical register: digitoxin appears almost exclusively in medical, pharmacological, and toxicological contexts and would rarely be encountered outside them. It is a countable noun when referring to individual preparations but is usually treated as an uncountable mass noun denoting the substance.
Easily confused with digitoxin
Digoxin is a related but chemically distinct cardiac glycoside derived from Digitalis lanata and is far more widely prescribed today, whereas digitoxin comes from Digitalis purpurea and has a much longer half-life.