Oleander: Benefits, Uses & Dosage

You have almost certainly walked past Oleander: a tidy ornamental shrub with pink, red, or white flowers, planted along roads and in gardens across warm climates. What most people do not know is that every part of it, root, bark, leaves, and flowers, is poisonous to the heart.

Ayurveda knows this plant as Karavira (करवीर), and in Hindi it is Kaner. Its botanical name is Nerium indicum Mill., and it is also called Indian Oleander. Its toxicity comes from cardiac glycosides such as oleandrin and neriine.

Classical texts treat it as poison used as medicine. The Sharangadhara Samhita lists it among the sub-poisons (Upavisha, secondary toxic substances), alongside Arka, Snuhi, Dhatura, and Langali. Its traditional role is almost entirely external: a root paste applied to stubborn skin disease, ringworm, and ulcers, and only under expert supervision.

This page explains what the tradition says about it. It is not a guide to using it yourself, because Oleander is not a herb for self-treatment.

Oleander's classical uses are real, but they belong to a qualified practitioner. Everything below is described in the texts as external application unless stated otherwise, and none of it is a suggestion to try at home.

Its properties explain why it was reached for. It is bitter and pungent in taste (Tikta, Katu rasa), light and sharp in quality (Laghu, Tikshna guna), and heating in potency (Ushna virya). Sharp, heating, bitter substances were used to cut through stubborn, oozing, or heavy conditions.

Skin Disease

The Bhavaprakasha Nighantu calls Oleander a skin-disease remedy (Kushtaghna). The root paste is applied to skin disorders, including the chronic conditions grouped under Kushtha (a broad classical category of skin disease, including leprosy), and to ringworm.

The Sharangadhara Samhita includes Oleander in a topical paste with Triphala, Padmaka, vetiver, Manjishtha, giant reed root, and Sariva for Kapha-type Visarpa (a spreading, inflamed skin condition). The text explains that Oleander acts there as a potent anti-inflammatory applied externally.

Ulcers and Sores

For genital ulcers and venereal sores (Upadamsha), the Sharangadhara Samhita describes Oleander root ground with water and applied as a paste, saying even ulcers considered incurable subside with it. It is also associated with stubborn ulcers more generally.

Abscesses

Under the name Hayamaraka, Oleander appears in a classical bursting paste (Darana lepa) used to open abscesses, together with Chitraka, Danti, and other ingredients.

Worms and Fungal Skin Infection

The Bhavaprakasha Nighantu also lists it as anthelmintic (Krimighna), connecting it to parasites and worms. Its use on ringworm links it to fungal skin conditions such as athlete's foot, again only as an external application.

A Note on the Heart

The Bhavaprakasha Nighantu marks Oleander as acting on the heart (Hridya) and flags this with a warning. Its cardiac glycosides are precisely what make it dangerous. Do not read this as a heart remedy: for anything involving the heart, see a doctor.

Oleander is not for home use in any form. Do not eat, drink, brew, or apply any part of the plant yourself. All parts are toxic, and the margin between a classical dose and harm is extremely small.

The table below records how classical texts describe its use by practitioners. It is here for understanding, not instruction.

The Bhavaprakasha Nighantu notes that the white-flowered variety is considered less toxic. Less toxic is not safe. It still contains the same class of heart-affecting compounds.

If you are dealing with a skin problem, ringworm, or an ulcer, the safe path is to see a qualified practitioner or doctor, not to reach for this plant.

Most Ayurvedic herbs are gentle. Oleander is the clear exception. It is poisonous, and it is not for self-treatment.

Why It Is Dangerous

All parts of the plant, root, bark, leaves, and flowers, contain cardiac glycosides, including oleandrin and neriine. These compounds act on the heart, which is why classical texts flag its heart action with a warning.

The Sharangadhara Samhita classifies Oleander as a sub-poison (Upavisha), in the same group as Dhatura and Snuhi. The Bhavaprakasha Nighantu states it must be used only under expert supervision because of its cardiac toxicity.

What This Means for You

• Do not take any part of Oleander by mouth.
• Do not make your own pastes, oils, or teas from the plant.
• Do not assume the white-flowered variety is safe. It is described only as less toxic.
• Keep garden plants away from children and pets.

Heart Conditions and Medications

Because its toxicity is cardiac, anyone with a heart condition or taking heart medication faces added risk. Never combine Oleander with any treatment.

If someone has swallowed any part of an Oleander plant, treat it as an emergency and contact emergency services or a poison control centre immediately.

Oleander is not something to choose between at home, so this is not a shopping comparison. It is a look at how Oleander sits beside the plants classical texts group it with.

Oleander is poisonous and not for self-treatment by anyone. For the groups below, the answer is simple.

Pregnancy & Nursing

Not for use during pregnancy or while nursing. Every part of the plant contains heart-affecting cardiac glycosides.

Children

Not for children. If you grow Oleander, keep it out of reach, and treat any swallowed leaf or flower as an emergency.

Elderly

Older adults, especially those with heart conditions or on heart medication, face added risk from its cardiac toxicity. It is not for self-use.

Athletes

There is no classical or practical reason for an athlete to use Oleander. Its action on the heart makes it dangerous, not performance-enhancing.