Histamine agonist

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A histamine agonist is a drug which causes increased activity at one or more of the four histamine receptor subtypes.

H2 : Betazole and Impromidine are examples of agonists used in diagnostics to increase histamine.

H3 : Betahistine is a weak Histamine1 agonist and a very strong Histamine3 antagonist (paradoxically histamine increasing).

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