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Related Experiment Videos

Why are non-sedating antihistamines non-sedating?

H Timmerman1

  • 1Leiden/Amsterdam Center for Drug Research, Department of Pharmacochemistry, Vrije Universiteit, Amsterdam, The Netherlands.

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
|August 12, 1999
PubMed
Summary

Antihistamines cause sedation via H1 receptor blockade in the brain. Brain penetration depends on factors beyond lipophilicity, including ionization and protein binding, influencing CNS side effects.

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Medicinal Chemistry

Background:

  • Antihistamines are widely used, but CNS side effects like sedation are a concern.
  • Understanding factors influencing drug entry into the central nervous system (CNS) is crucial for drug development.

Purpose of the Study:

  • To discuss factors influencing CNS side effects of antihistamines.
  • To elucidate the relationship between drug properties and blood-brain barrier penetration.

Main Methods:

  • Pharmacological studies on H1 receptor affinity.
  • Analysis of lipophilicity (log P) and ionization (log D) for CNS penetration.
  • Introduction of Deltalog P to assess hydrogen binding capacity.
  • Evaluation of P-glycoprotein transport and histamine's effect on blood-brain barrier permeability.

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Main Results:

  • H1 receptors in CNS and peripheral organs show similar affinity for H1 blockers; no evidence for H1 receptor subtypes.
  • Sedation is directly caused by H1 receptor blockade.
  • Brain penetration is not solely determined by lipophilicity (log P); optimal penetration occurs at intermediate log P/log D values.
  • High protein binding, indicated by Deltalog P, reduces brain penetration.
  • P-glycoprotein acts as an efflux transporter, limiting CNS drug entry.
  • Histamine increases blood-brain barrier permeability.

Conclusions:

  • CNS side effects of antihistamines are primarily due to H1 receptor blockade and influenced by complex pharmacokinetic factors.
  • Drug properties like ionization, hydrogen binding capacity, and transporter interactions significantly affect brain penetration and efficacy.
  • Further research into these factors can guide the development of antihistamines with improved safety profiles.