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1 From the Merck Institute for Therapeutic Research, Rahway, New Jersey, and the Mount Sinai Hospital, New York, New York
1. Thiamine (5-15 mgm. per 100 cc.) inhibits the action of nicotine in the isolated intestine of rabbits and guinea pigs. Cocarboxylase has the same effect as thiamine. The action of drugs stimulating sympathetic or parasympathetic nerve endings is not influenced by thiamine.
2. This effect of thiamine is linked to the thiazole moiety of the thiamine molecule and appears to be analogous to the effect of certain sulfonamides.
3. Thiamine also inhibits the action of nicotine in the striated muscle of frogs.
4. The effect of thiamine upon the nicotine action is not influenced by prostigmine.
5. The processes involved in the inhibition of the nicotine action in synapses and in end plates at the myoneural junction are discussed.
Submitted on May 24, 1944
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