3,4-Diaminopyridine, or 3,4-DAP, is used to treat muscle diseases such as Lambert–Eaton myasthenic syndrome. It has also been used to relieve the symptoms of botulinum neurotoxin type A (BoNT/A) poisoning (botulism), but it penetrates the blood–brain barrier and produces neurotoxic side effects. K. J. Janda and coauthors have recently shown that the 3,4-DAP derivative 3,4,5-triaminopyridine overcomes this problem and has anti-BoNT/A potency equal to 3,4-DAP.
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