Epibatidine is about 100 times more potent than morphine, and derived from frogs native to South America Russia killed Alexei Navalny with frog toxin, UK and four European allies say Epibatidine is about 100 times more potent than morphine, and derived from frogs native to South America Russia killed Alexei Navalny with frog toxin, UK and four European allies say Epibatidine, the dart frog toxin Britain says was used to kill Alexei Navalny , is about 100 times more potent than morphine. The