Arka: Benefits, Uses & Dosage

Walk past almost any dry roadside or patch of wasteland in India and you will likely see Madar, a tough shrub with thick leaves that bleeds a white, milky latex the moment you snap any part of it. Ayurveda calls it Arka (Arka, one of its Sanskrit names, also meaning "the sun"). It is a plant with two faces: classical texts list it among the sub-poisons, yet value it highly as a medicine when it is properly processed.

Its botanical name is Calotropis procera, and in English it also goes by Swallow-wort, Crown Flower and Giant Milkweed. In Hindi it is known as Madar, Aak or Akaua. Two kinds are described: the white-flowered Arka (Shveta Arka), which is Calotropis procera, and the purple-flowered Arka (Rakta Arka, also called Alarka), which is Calotropis gigantea.

The Bhavaprakasha describes the root bark as the most used part, especially for hemorrhoids, skin diseases and abdominal complaints. The latex (Arka Kshira) is applied externally for skin conditions and joint pain, the leaves are used in sweating therapy (Swedana) for swelling, and the flowers are used in cough and asthma.

Arka is not a herb for casual home use. This page explains what the classical texts say about it, and why most of its traditional uses are external or belong in the hands of a trained practitioner.

Arka tastes pungent (Katu) and bitter (Tikta), and its qualities are light, dry and sharp (Laghu, Ruksha, Tikshna). It has a heating potency (Ushna Virya), meaning it warms the body. These sharp, hot, drying qualities explain both why it is useful and why it must be handled carefully.

The Bhavaprakasha lists its main actions as kindling digestion (Deepani), purging (Virechana), inducing vomiting (Vamana), killing worms (Krimighna), countering skin disease (Kushtaghna), reducing swelling (Shothahara) and countering toxins (Vishaghna).

Hemorrhoids

Hemorrhoids (Arsha) are the use Arka is best known for. The Bhavaprakasha names Arsha among its classical uses, and the processed root bark is the part relied on here. Arka also appears among the herbs in the hemorrhoid chapter of the Charaka Samhita (Chikitsa Sthana 14). See our page on hemorrhoids and piles for the wider Ayurvedic approach.

Skin Health

Skin disease (Kushtha) is a core classical use, and its latex is applied externally to the skin. The Sharangadhara Samhita (Uttara Khanda 11) describes a paste of Arka root bark ground with turmeric (Haridra) to clear long-standing facial dullness. Learn more on our skin disorders page.

The same chapter describes Arka latex as one ingredient of a paste used to burst abscesses, and Arka leaf juice in a hair-removal paste. These are strong, specialist preparations, not cosmetic recipes to try at home.

Swelling and Inflammation

Arka leaves are a classic ingredient in sweating or fomentation therapy (Swedana). The Charaka Samhita (Chikitsa Sthana 12, on edema) advises adding leaves of Vasa, Arka, Karanja, Shigru, Kashmarya and holy basil to hot water and using it, tolerably hot, for sudation. The Ashtanga Hridaya lists Arka among the leaves boiled for liquid sudation (Drava Sweda).

This links Arka to edema and swelling and to inflammation, particularly swollen joints.

Abdominal Complaints

The Bhavaprakasha lists abdominal lumps (Gulma) and an enlarged spleen (Pleeha) among its uses. The Charaka Samhita (Chikitsa Sthana 13, on abdominal diseases) describes a paste of devadaru, palasha, Arka, hastipippali, shigru and ashwagandha mixed with cow's urine, applied over the abdomen. Our sources also link Arka to liver disorders.

Worms and Parasites

Its anthelmintic action (Krimighna) places it among the classical remedies for worms (Krimi). See parasites and worms for safer, more commonly used options.

Cough, Asthma and the Eyes

The Bhavaprakasha lists cough (Kasa) and asthma (Shwasa) among its uses, and notes that the flowers are the part used here. The Sushruta Samhita (Uttara Tantra 11) names Arka in a group of herbs for Kapha-type conjunctivitis. These are traditional, practitioner-led uses only.

Arka is used very differently from everyday herbs like Amla or Ashwagandha. The classical texts favor processed root bark and external applications, and they classify the plant as a sub-poison. Our sources give no specific doses for any form, so any internal use should be set and supervised by a qualified Ayurvedic practitioner.

Sweating Therapy With Arka Leaves

The safest and most widely described use is fomentation (Swedana). The Charaka Samhita describes adding Arka leaves, along with other leaves such as Vasa and Karanja, to hot water and taking sudation with the tolerably hot liquid. This is done in Ayurvedic clinics as part of treatment for swelling.

A Traditional Twig Toothbrush

The Ashtanga Hridaya (Sutrasthana, Daily Routine) lists Arka among the twigs that can be used to clean the teeth, alongside banyan, Khadira, Karanja and Arjuna. Given the irritant latex, choose one of the other listed twigs unless a practitioner advises otherwise.

Why Processing Matters

The Bhavaprakasha stresses that Arka is valuable when used properly in processed form. Never prepare the raw root, latex or leaves for internal use yourself.

Most Ayurvedic herbs are gentle enough for everyday use. Arka is an important exception, and it deserves real caution.

A Classical Sub-Poison

The Sharangadhara Samhita (Madhyama Khanda 12) lists Arka among the sub-poisons (Upavisha), the secondary toxic substances, alongside Snuhi, Dhatura, Langali and Karavira (oleander). The Bhavaprakasha also describes it as somewhat toxic, valuable only when used properly in processed form.

Why It Is Strong

• The root bark contains cardiac glycosides, compounds that act on the heart.
• Its listed actions include purging (Virechana) and inducing vomiting (Vamana), so careless internal use can be harsh.
• It is sharp, dry and heating in quality, which makes it irritating rather than soothing.
• The latex is strong enough to be used classically in pastes that burst abscesses and remove hair, which tells you how it can affect skin.

Practical Precautions

• Do not take any part of Arka internally without a qualified practitioner.
• Do not apply raw latex to your skin on your own, and keep it away from the eyes.
• Our sources give no specific doses, and no data on drug interactions. Given the cardiac glycosides in the root bark, tell your doctor if you take any heart medication before any use.
• Avoid it during pregnancy and nursing, and do not give it to children.

If anyone swallows Arka latex or raw plant material, or develops vomiting, severe diarrhea or a strong skin reaction after contact, seek medical help promptly.

Arka is often named in the same classical recipes as a few other plants. Here is how it compares with the ones that appear alongside it in our sources.

Comparison	Arka	Alternative	Verdict
Arka vs Snuhi	Milky latex plant listed as a sub-poison (Upavisha); latex used externally for skin, sinus wounds and abscesses	Snuhi (Euphorbia neriifolia) is also a latex plant listed as a sub-poison, and its latex is paired with Arka latex in the Sushruta Samhita and Sharangadhara Samhita	Both are strong, specialist latex herbs. Neither is for self-use; they are usually combined by practitioners rather than chosen between.
Arka vs Karanja	Leaves used in sudation for swelling; twig listed for cleaning teeth	Karanja (Pongamia pinnata) appears alongside Arka in the same sudation recipe and the same tooth-twig list	For a tooth-cleaning twig, Karanja is the more practical pick, since Arka bleeds irritant latex. For fomentation the classics use them together.
Arka vs Vasa	One of several leaves in the Charaka Samhita sudation water for edema	Vasa leaves are named first in that same sudation recipe	Equal partners in that recipe. Let your practitioner decide the mix.
Arka vs Turmeric for the skin	Root bark ground into a face paste for long-standing dullness	Turmeric (Haridra) is the partner ingredient in that same Sharangadhara Samhita paste	The classical recipe uses both together. On its own, turmeric is the far gentler choice for home skin care.

Because classical texts class Arka as a sub-poison (Upavisha), the general rule for every group is the same: no self-treatment, and internal use only under a qualified practitioner. Our sources give no population-specific doses or safety studies.

Pregnancy & Nursing

Our sources contain no safety data for pregnancy or breastfeeding. Arka's listed actions include purging and inducing vomiting, and its root bark contains cardiac glycosides. Avoid it completely, internally and as latex on the skin, unless a practitioner who knows you are pregnant or nursing specifically advises it.

Children

There is no safety data for children in our sources. Do not give Arka to children, and keep the plant and its latex out of their reach, since it grows wild and its milky sap is easy to touch.

Elderly

Our sources give no specific guidance for older adults. Because the root bark contains compounds that act on the heart, older people, especially those taking heart medication, should only use Arka under close medical and practitioner supervision.

Athletes

Our sources do not describe any use of Arka for athletic performance. Its leaf fomentation for swollen joints is traditionally given in a clinical setting, and athletes interested in it should seek it there rather than improvise at home.