What is epibatidine? The lethal dart frog toxin linked to Alexei Navalny’s death

Dart frog poison explained: The deadly toxin allegedly used against Alexei Navalny

Five European countries, the UK, France, Germany, Sweden and the Netherlands, have alleged that the Russian administration used a rare poison derived from poison dart frogs to kill Russian opposition leader Alexei Navalny.

In a joint statement, the foreign ministries said laboratory findings indicated exposure to an extremely lethal toxin normally found in the skin of tropical amphibians.

What is the dart frog toxin?

Scientists identify the suspected substance as epibatidine, a highly potent neurotoxic alkaloid obtained from the Epipedobates genus of poison dart frogs native to northern South America.

These brightly coloured rainforest amphibians store toxic chemicals in their skin as a defence against predators. Researchers believe the poison originates from their diet, as captive-bred frogs typically lack the toxin.

Epibatidine attracted scientific interest because of its strong pain-relief properties but has never been approved for medical use due to extreme toxicity.

How the poison affects the human body

Experts say epibatidine interferes with nerve signalling by acting on nicotinic receptors in the nervous system.

Professor Alastair Hay, emeritus professor of environmental toxicology at the University of Leeds, explained, “The effect of blocking these receptors is muscle paralysis and paralysis of the respiratory system. So, breathing is blocked, and any person poisoned dies from suffocation.”

The compound is estimated to be dozens, and in some studies up to 100 times, more potent than morphine and far stronger than nicotine. Symptoms linked to exposure include seizures, paralysis and respiratory failure.

Hay added, “The presence of the toxin in a person’s blood suggests deliberate administration.”

Possible treaty violations

The professor also said, “If epibatidine, a toxin, was indeed used to poison Alexei Navalny, this is in violation of the 1972 Biological and Toxin Weapons Convention (BTWC) and the 1993 Chemical Weapons Convention (CWC).”

Russia is a signatory to both treaties.

How investigators detect the toxin

Investigators can identify epibatidine through gas chromatography and mass spectrometry, which separate chemical compounds and generate a molecular fingerprint unique to the substance.

Political fallout

Navalny’s wife, Yulia Navalnaya, blamed Russian President Vladimir Putin for the death and said the findings confirmed long-held suspicions that a chemical weapon was used.

The Kremlin has not accepted responsibility, and the allegations are likely to intensify international pressure and diplomatic tensions.