Question 1

How does Strophanthus hispidus work on the heart?

Accepted Answer

Strophanthus hispidus contains cardiac glycosides, primarily ouabain and strophanthin, which inhibit the sodium-potassium ATPase pump in cardiac cells. This inhibition increases intracellular calcium concentrations, strengthening myocardial contractions and improving cardiac output. The mechanism is similar to digitalis (foxglove), though ouabain has a faster onset and shorter half-life. Evidence Level: C (preclinical and historical clinical data).

Question 2

What drugs interact with Strophanthus hispidus?

Accepted Answer

Strophanthus hispidus has significant drug interactions due to its cardiac glycoside content. It should never be combined with other cardiac glycosides (digoxin, digitoxin), as this increases toxicity risk. Concurrent use with diuretics, corticosteroids, or laxatives may worsen electrolyte imbalances and increase arrhythmia risk. Beta-blockers and calcium channel blockers may have additive effects on heart rate. Medical supervision is essential. Evidence Level: C.

Question 3

What is the safe dosage of Strophanthus hispidus?

Accepted Answer

There is no established safe self-medication dosage for Strophanthus hispidus. The plant is highly toxic and has historically been used as an arrow poison. Therapeutic use requires professional medical supervision with standardized pharmaceutical preparations. The therapeutic window is extremely narrow, and improper dosing can cause fatal cardiac arrhythmias. Traditional preparations vary widely in potency. This herb should only be used under qualified medical guidance. Evidence Level: C.

Question 4

Is Strophanthus hispidus safe during pregnancy and breastfeeding?

Accepted Answer

Strophanthus hispidus is unsafe during pregnancy and breastfeeding. The cardiac glycosides can cross the placenta and may affect fetal heart development and rhythm. The plant's toxic compounds can also pass into breast milk, posing serious risks to nursing infants. Additionally, the narrow therapeutic window makes any use during pregnancy particularly dangerous. Pregnant or breastfeeding individuals should avoid this herb entirely. Evidence Level: C.

Question 5

What is Strophanthus hispidus used for in herbal medicine?

Accepted Answer

Strophanthus hispidus has been historically used for heart failure and various cardiac conditions. The plant's cardiac glycosides, including ouabain, provide inotropic effects that strengthen heart contractions. In West Africa, it was traditionally used as an arrow poison. Modern medicine has isolated compounds like ouabain for pharmaceutical cardiac applications. However, due to its high toxicity and narrow therapeutic window, professional medical supervision is required for any therapeutic use. Evidence Level: C.

Question 6

What are the side effects and toxicity risks of Strophanthus hispidus?

Accepted Answer

Strophanthus hispidus carries significant toxicity risks. Common side effects include nausea, vomiting, and abdominal discomfort. More serious effects involve cardiac arrhythmias, including bradycardia, atrioventricular block, and ventricular fibrillation. Overdose can be fatal due to cardiac arrest. The plant has a narrow therapeutic window, meaning the difference between therapeutic and toxic doses is small. Kidney disease increases toxicity risk. Immediate medical attention is required if toxicity is suspected. Evidence Level: C.

Strophanthus Hispidus

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Calculate a safe dose of Strophanthus Hispidus

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Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Evidence summary

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