| Summary: | Tetrodotoxin (TTX), a blocker of sodium channels, exists in the pufferfish, amphibians, and octopus, and originated in endosymbiont-vibrio. Researches have confirmed that TTX affected the action potential through the regulation of voltage-gated sodium channels (VGSCs) and the ingestion of TTX inhibits the nerve signal’s transmission, showing symptoms like rapid weakening and paralysis of the muscles. Recent research shows that TTX’s medical value as the analgesic is mainly focused. The comparison on efficacy among placebo, TTX, and opioids manifests that TTX is healthy and effective in treating neuropathic pain. Moreover, since the drug is synthesized by TTX, it can block specific neurons to alleviate the pain on different parts of the body accurately. Currently speaking, TTX has been widely used as medicine for the alleviation of cancer pain. The mechanism, symptoms, application, and treatment are thoroughly discussed to popularize TTX and pass the “torch” to the new generation because there is still a long way to go—the unsolved mysteries of TTX awaiting humans.
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