A histamine agonist is a drug which causes increased activity at one or more of the four histamine receptor subtypes. H1 agonists promote wakefulness. 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 antagonist of the Histamine3 autoreceptor. Antagonizing H3 increases histaminergic tone.
See also Histamine antagonist
References
External links Histamine+agonist at the U.S. National Library of Medicine Medical Subject Headings (MeSH) MeSH list of agents 82017442
