What is morning medicine?

The morning medicine is actually the traditional Chinese medicine Semen Strychni, and the main component of Semen Strychni is brucine. After eating it, people will start to twitch, and finally they will die with their feet. It looks like a tractor, so it is named "tractor medicine".

Strychnine (also known as brucine, English) is a highly toxic chemical, which is generally used to poison rodents such as mice. It is also highly toxic to humans (the lethal dose for adults is about 5 mg/kg body weight).