Kuppameniya (Acalypha indica): The Cat's Weed, and a Serious Warning

Kuppameniya (Acalypha indica) is known to most Sri Lankans for something charming: cats dig up its roots and roll about in a catnip-like daze. It is also the subject of published case reports from Sri Lankan hospitals describing patients who nearly died after swallowing it. Both facts belong on the same page.

Botanical and Cultural Background

Kuppameniya is an erect annual herb of the Euphorbiaceae family, growing to around half a metre, with soft toothed leaves and inconspicuous greenish flower spikes. It appears in gardens, drains and waste ground everywhere in Sri Lanka, unbidden.

Its effect on cats is genuine and well known — puskola in some usages — and the plant is often pointed out to children for exactly this reason.

Traditional Uses in Sri Lankan Medicine

Skin conditions

Leaf paste is applied traditionally for scabies, ringworm, eczema and skin ulcers. This external use is the plant's most defensible application.

Cough and phlegm

Leaf juice has been used traditionally as an expectorant and, in larger amounts, as an emetic to provoke vomiting and clear phlegm.

Worms

A leaf or root infusion is used traditionally as an anthelmintic.

Joint pain

Leaves warmed in sesame oil and applied externally to swollen joints.

What the Research Shows

Laboratory studies report antibacterial, antifungal and anti-inflammatory activity for Acalypha indica extracts, which fits its traditional external use for skin infections. Human clinical evidence is absent.

The important research finding is a toxicological one, and it concerns Sri Lanka directly. Clinicians here and in India have published cases of acute intravascular haemolysis — the destruction of red blood cells — after people ingested Acalypha indica. Patients have presented with dark urine, jaundice, collapse and severe anaemia; some required blood transfusion, and deaths have been reported. The cases cluster in people with glucose-6-phosphate dehydrogenase (G6PD) deficiency, an inherited enzyme condition that is common across South Asia and which most people who have it do not know about.

This transforms how the plant should be treated. An unknown proportion of Sri Lankans carry a trait that makes swallowing this common weed genuinely hazardous, and there is no way to tell by looking.

How Kuppameniya Is Prepared

Leaf paste (external): Fresh leaves ground with a pinch of turmeric and applied to affected skin.

Warm poultice: Leaves fried briefly in sesame oil and bound over a painful joint.

Internal preparations exist in tradition but, for the reasons below, are not something to attempt at home.

Safety and Precautions

Do not induce vomiting in someone having an asthma attack, and do not give kuppameniya to a child for one. This practice is traditional and it is dangerous. Asthma attacks kill people; the treatment is a reliever inhaler and, if it is not working, urgent medical help. Making a breathless child vomit risks inhaling stomach contents into the lungs, and — worse — it consumes the minutes in which the attack should have been treated. Nothing about clearing phlegm justifies this.

Do not take kuppameniya internally. Because of the documented risk of severe haemolysis in people with G6PD deficiency — a condition that is common in this region and usually silent until something triggers it — the sensible position is to confine kuppameniya to external use. If someone has swallowed it and develops dark or red-brown urine, yellow eyes, breathlessness, extreme weakness or collapse, that is a medical emergency: go to hospital immediately and tell them what was taken.

External use is generally well tolerated, though anyone with sensitive skin should test a small area first. Do not use it internally in pregnancy or breastfeeding, and do not give it to children. Persistent or spreading skin infection needs a doctor rather than repeated home treatment.