Cocculus indicus is the traditional name for the dried berries of Anamirta cocculus, a climbing vine native to tropical Asia. The plant has a long history as a fish poison and is now primarily known as a homeopathic remedy marketed for motion sickness. Its berries contain about 1% picrotoxin, a potent compound that acts on the central nervous system and makes the raw plant material genuinely toxic.
The Plant Behind the Name
Anamirta cocculus is a woody climbing vine, or liana, that grows in wet tropical forests across South and Southeast Asia. It produces clusters of small, dark berries that have been harvested for centuries. The berries themselves are the part most commonly referenced when people use the name “cocculus indicus,” though other parts of the plant, including the roots, have also been used traditionally in some regions.
Picrotoxin and Why the Berries Are Toxic
The berries’ potency comes from picrotoxin, a compound made up of two components: picrotoxinin (the active one) and picrotin (which is inactive on its own). Picrotoxin works by blocking receptors in the brain that normally respond to GABA, a chemical messenger responsible for calming nerve activity. Specifically, it reduces how often these receptors open, meaning nerve cells lose one of their main braking systems. The result is overstimulation of the nervous system, which is why picrotoxin is classified as a convulsant.
In practical terms, this means ingesting raw cocculus indicus berries can cause seizures, vomiting, and potentially life-threatening poisoning. The berries are not safe to eat or use in any crude form.
Historical Use as a Fish Poison
Long before the berries entered homeopathic pharmacies, they were used across southern Asia as a way to catch fish. Communities in India, Arabia, Sumatra, and Cochin China (modern-day Vietnam) would crush the berries or fruit and scatter them in water. The picrotoxin would stun or paralyze fish, making them float to the surface for easy collection. This practice was documented across dozens of cultures, and Anamirta cocculus appears repeatedly in ethnobotanical records of fish-poison plants compiled by the Smithsonian Institution. The technique worked precisely because of the compound’s ability to disrupt nervous system function.
Homeopathic Use for Motion Sickness
Today, most people encounter cocculus indicus as a homeopathic product sold in pellet form. These products are made from the seeds of Anamirta cocculus and are typically sold at extreme dilutions, commonly labeled as 30C. In homeopathic terminology, 30C means the original substance has been diluted 1 part per 100, thirty times over, resulting in a preparation where virtually no molecules of the original plant material remain.
Homeopathic cocculus indicus is marketed primarily for motion sickness relief. Product labels registered with the FDA list this as the sole indication. Some homeopathic practitioners also recommend it for vertigo, nausea, and exhaustion from sleep deprivation, though these uses appear mainly in homeopathic literature rather than in regulated product labeling.
It’s worth understanding what this means in practice. Because of the extreme dilution involved, homeopathic cocculus indicus pellets do not contain a pharmacologically active dose of picrotoxin. The mechanism by which homeopathy claims to work (that water retains a “memory” of the diluted substance) is not supported by mainstream pharmacology or clinical evidence. The product is unlikely to cause the toxic effects associated with raw cocculus berries, but there is also no conventional scientific basis for expecting it to treat motion sickness.
Regulatory Standing
Homeopathic cocculus indicus products are listed in the Homeopathic Pharmacopoeia of the United States (HPUS), which gives them a pathway to market in the U.S. without the same approval process required of conventional drugs. The FDA has historically exercised enforcement discretion over homeopathic products, meaning they are available over the counter but have not undergone the clinical trials required of standard medications.
Picrotoxin itself has a separate, limited regulatory history. The FDA once listed it as an active ingredient in over-the-counter products intended to treat lice (pediculicides), but that category was classified under a review status that did not confirm it as safe and effective for that purpose.
Safety Considerations
The raw plant material is poisonous and should never be consumed outside of regulated homeopathic preparations. Even homeopathic product labels advise stopping use and consulting a practitioner if symptoms worsen or if you are pregnant or nursing. While the extreme dilution of homeopathic preparations makes acute toxicity unlikely, the lack of rigorous clinical testing means safety data is limited, particularly for vulnerable populations like pregnant women or people taking other medications.