Question 1

How does Thevetia peruviana affect the heart?

Accepted Answer

Thevetia peruviana contains potent cardiac glycosides, including thevetin A, thevetin B, peruvoside, and neriifolin. These compounds inhibit the sodium-potassium ATPase pump in cardiac cells, which increases intracellular calcium and strengthens cardiac muscle contractions. This mechanism is similar to digoxin but with a significantly narrower therapeutic window. Evidence Level C. The unpredictable potency of these glycosides makes the difference between a therapeutic and lethal dose extremely small, which is why internal use is considered highly dangerous and not recommended in modern practice.

Question 2

What drugs interact with yellow oleander (Thevetia peruviana)?

Accepted Answer

Thevetia peruviana has dangerous interactions with cardiac medications. Concurrent use with digoxin or other cardiac glycosides can cause additive toxicity, leading to potentially fatal arrhythmias. Diuretics may worsen toxicity by causing electrolyte imbalances, particularly hypokalemia. Medications like quinidine, verapamil, and amiodarone can increase cardiac glycoside concentrations. Evidence Level C. Due to the extreme toxicity of Thevetia peruviana, internal use is contraindicated with any medications, as the plant itself poses life-threatening risks independent of drug interactions.

Question 3

What is the safe dosage of Thevetia peruviana?

Accepted Answer

There is no established safe dosage for Thevetia peruviana. The plant contains cardiac glycosides with an extremely narrow therapeutic index, meaning the toxic dose is very close to any potentially therapeutic dose. The seeds are particularly dangerous, with ingestion of even small amounts capable of causing fatal cardiac arrhythmias. Evidence Level C. Medical literature documents numerous fatalities from accidental and intentional ingestion. Due to the high risk of death, no internal dosage is recommended. External applications in traditional medicine require professional guidance and are not standardized.

Question 4

Is yellow oleander safe during pregnancy?

Accepted Answer

Thevetia peruviana is absolutely contraindicated during pregnancy and breastfeeding. The cardiac glycosides, including thevetin and peruvoside, can cross the placenta and cause fetal harm, including cardiac arrhythmias and potential fetal death. Evidence Level C. The plant's extreme toxicity poses life-threatening risks to both mother and developing fetus. No traditional or modern evidence supports any safe use during pregnancy. All parts of the plant, especially the seeds, should be strictly avoided throughout pregnancy, lactation, and in women who may become pregnant.

Question 5

Is Thevetia peruviana poisonous to humans?

Accepted Answer

Yes, Thevetia peruviana (yellow oleander) is extremely poisonous to humans. All parts of the plant contain cardiac glycosides, with the seeds being most toxic. Ingestion can cause nausea, vomiting, abdominal pain, dizziness, and potentially fatal cardiac arrhythmias. Evidence Level C. The plant is responsible for numerous poisoning cases globally, particularly in tropical regions where it grows as an ornamental. Even small amounts require immediate emergency medical attention. Despite historical use in folk medicine, internal consumption is never recommended due to documented fatalities and the lack of a safe therapeutic window.

Question 6

What are the traditional uses of Thevetia peruviana?

Accepted Answer

Historically, Thevetia peruviana has been used in folk medicine for treating heart conditions and, externally, for various skin ailments. The cardiac glycosides were researched as potential alternatives to digoxin, but development did not progress due to unacceptable toxicity risks. Evidence Level C. Some traditional systems apply the plant externally for skin conditions, though safety data for even topical use remains limited. Modern medical practice does not endorse internal use under any circumstances due to the documented risk of fatal cardiac toxicity and the availability of safer alternatives.

Thevetia peruviana

Sources & Citations

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources