What poison that starts with t?

One well-known poison that starts with "T" is tetrodotoxin. This potent neurotoxin is found in certain species of pufferfish and can cause paralysis and respiratory failure if ingested. Tetrodotoxin works by blocking sodium channels in nerve cells, leading to a disruption in communication between nerves and muscles. Because of its toxicity, it is considered highly dangerous and has no known antidote.