Kaner: Benefits, Uses & Dosage

You have almost certainly walked past Kaner without a second thought. The Sweet-scented Oleander is a familiar ornamental shrub, grown for its red or white flowers, yet in Ayurveda it sits in a category that demands respect: it is classed as a poison (Visha), a substance that can cause serious harm outside of skilled hands.

Its botanical name is Nerium odorum Soland. In Sanskrit it is called (Karavira), and Hindi speakers know it as Kaner or Lal Kaner, the red-flowered form. Other Sanskrit names include (Shatakumbha) and (Ashvamaraka), the latter often read as "horse killer", a name that says a lot about the plant's potency.

The Bhavaprakash Nighantu describes the root, bark, leaves and flowers as all having medicinal uses. The plant contains cardiac glycosides, compounds that act on the heart, which is why the classical tradition links it to heart conditions when used in proper doses, and why it is dangerous when it is not. Its best known traditional use is external: a root paste applied to skin diseases and parasitic skin infections.

This page explains what the tradition says about Kaner. It is not a guide to using it at home. Any internal use belongs strictly under a qualified practitioner.

Kaner's classical uses are narrow and come with a strong caveat: it is a poisonous plant (Visha). The benefits below describe what the Bhavaprakash Nighantu records. They are not an invitation to self-treat.

Skin Health

Kaner is described as (Kusthaghna), meaning it works against skin diseases. In Ayurveda, Kushtha is a broad term covering many chronic skin disorders.

The traditional method is external: a paste of the root applied to the affected skin. Its bitter (Tikta) and astringent (Kashaya) tastes, along with its light (Laghu) and dry (Ruksha) qualities, fit the classical picture of a herb that dries and clears.

Parasites and Skin Infections

The text calls Kaner (Krimighna), an agent against worms and parasites. The external root paste is specifically described for parasitic skin infections.

Heart

Kaner is listed as (Hridya), a cardiac tonic, and is linked to heart disease (Hridroga). This reflects its cardiac glycosides, compounds that act directly on heart function.

This is exactly where the danger lies. The same compounds that make it useful in proper doses make it toxic in the wrong ones. Heart-related use is a matter for a qualified physician only.

Swelling

The text also lists Kaner as (Shothahara), reducing swelling, and our records connect it with inflammation (Shotha).

Dosha Effect

Kaner has a hot potency (Ushna Virya), the warming or cooling effect a herb has on the body, and a pungent post-digestive effect (Katu Vipaka), the taste quality it leaves after digestion. The plant is described as bitter, hot and sharp, and effective against Kapha and Vata disorders.

Kaner is not a herb for self-dosing. It is classified as poisonous (Visha), and the classical text stresses that it must be used with extreme caution. Its heart-related value depends on proper doses, which only a trained practitioner can judge.

The table below summarises the forms the tradition describes. We deliberately give no home dosage, because our source does not provide one and guessing with this plant could be dangerous.

The root, bark, leaves and flowers all have recorded medicinal uses, but that does not make any part safe to eat. If you grow oleander in your garden, treat every part of it as toxic.

Most Ayurvedic herbs are gentle. Kaner is one of the clear exceptions. The Bhavaprakash Nighantu classifies it as a poison (Visha) and says it must be used with extreme caution.

Why It Is Dangerous

Kaner contains cardiac glycosides, compounds that act on the heart. Its recorded constituents include oleandrine, neriodorin, neriodorein and rosaginine, among others. These are the reason it was used for heart conditions in proper doses, and the reason it can be harmful in improper ones.

One of its Sanskrit names, (Ashvamaraka), is commonly read as "horse killer". The name is a warning worth taking seriously.

Key Precautions

• Do not eat, chew or brew any part of the plant: root, bark, leaves or flowers.
• Do not take Kaner internally except under the direct supervision of a qualified physician.
• Do not combine it with any heart medication on your own; its glycosides act on the heart.
• Keep garden oleander away from children and pets.
• Even the external root paste should be used only on a practitioner's advice.

If Someone Swallows It

Treat any ingestion of oleander as a medical emergency and contact emergency services or a poison control centre straight away.

Kaner is rarely a direct substitute for anything, because its toxicity puts it in a class of its own. The comparisons below are the ones that actually matter when you are trying to understand this plant.

Because Kaner is classified as a poison (Visha) and contains heart-active cardiac glycosides, the guidance for every group starts from the same place: no self-use. The notes below simply make that clear for each population.

Pregnancy & Nursing

Avoid Kaner entirely during pregnancy and while nursing. Our source gives no safe use for these stages, and the plant's toxicity makes the risk unacceptable.

Children

Kaner should never be given to children. Since oleander is a common garden ornamental, keep children away from the flowers, leaves and seeds, and treat any accidental swallowing as an emergency.

Elderly

Older adults are more likely to have heart conditions or take heart medication. Because Kaner's glycosides act directly on the heart, it should only ever be considered by a physician who knows the full medical picture.

Athletes

There is no traditional or practical role for Kaner in sport or training. Its effects on the heart make it unsuitable for anyone seeking performance or recovery support.