The H3 receptor agonist exhibits all   of the following actions EXCEPT
H3 receptors act as pre-synaptic receptors and decrease the release of histamine and other neurotransmitters. These antagonize H1 mediated wakefulness and bronchoconstriction. These also decrease gastrin release and produce negative chronotropic effect. Inverse agonist of H3 receptor (tiprolisant) is approved for Narcolepsy.