Tetrodoxine conjugate and its preparation method and application. A synthetic carboxyl-containing
polymer compound and tetrodoxine are used as raw materials, a catalyst and a
solvent are added, and a tetrodoxine conjugate is obtained through a
coupling reaction. The carboxyl-containing
polymer compound is selected from carboxylated
dextran or carboxylated β-
cyclodextrin. The tetrodoxine conjugate can be used to prepare
sodium channel blockers and drugs for treating
neuropathic pain caused by
chemotherapy. The tetrodoxine conjugate of the present invention has
analgesic efficacy associated with TTX, and the
drug window is enlarged, and the safety of medication is greatly improved.