receptor

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Related to H1 receptors: H1 receptor antagonist, HRH1
See: receiver
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Histamine receptors mediating histamine-induced gut contractility are well expressed in both non-Hirschsprung and Hirschsprung's cases, but these are not mediated by H1 receptors.
5) Because these drugs act as competitive antagonists at the histamine receptors, they are not useful in anaphylaxis where the H1 receptors are already well occupied by histamine.
Haloperidol has a relatively weak binding affinity to the H1 receptor, (8) but causes more sedation at higher doses.
Since they bind to H1 receptors with high affinity and independent of the dose, a single daily dose provides treatment compliance.
Using an X-ray beam 100 billion times stronger than normal, they got a 3D picture of the shape of H1 receptors - the protein drugs protect from allergy-causing histamines.