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ANTIHISTAMINES - Coggle Diagram
ANTIHISTAMINES
H1 ANTIHISTAMINES
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Block the effects of histamine by competitively binding to H1 receptors, preventing histamine from activating these receptors. This action reduces the symptoms of allergic reactions, such as itching, sneezing, and runny nose, and helps alleviate other conditions like motion sickness and insomnia.
H2 ANTIHISTAMINES
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Decrease gastric acid secretion by reversibly binding to histamine H2 receptors located on gastric parietal cells, inhibiting the binding and activity of the endogenous ligand histamine. H2 blockers thus function as competitive antagonists.