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H1 Antihistamines- amine ethanols/ethers
diphenhydramine
carbinoxamine maleate
clemastine fumarate
doxylamine
H1 antihistamines- Ethylendiamines
pyrilamine
thonzylamine
H1 Antihistamines- Cyclizines
Chlorcyclizine
Meclizine
H1 receptor function and location
Gq; Increase IP3 and DAG
smooth muscle, brain
H2 receptor function and location
Gs; increase cAMP
gastric mucosa; cardiac muscle
H3 receptor function and location
Gi; decrease cAMP
brain, neurons
H4 receptor function and location
Gi; decrease cAMP
neutrophils, mast cells
Formation of histamine
from AA L-histidine by the enzyme histadine decarboxylase