Chemistry:Peripherally selective drug

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Peripherally selective drugs have their primary mechanism of action outside of the central nervous system (CNS), usually because they are excluded from the CNS by the blood–brain barrier. By being excluded from the CNS, drugs may act on the rest of the body without producing side-effects related to their effects on the brain or spinal cord. For example, most opioids cause sedation when given at a sufficiently high dose, but peripherally selective opioids can act on the rest of the body without entering the brain and are less likely to cause sedation.[1] These peripherally selective opioids can be used as antidiarrheals, for instance loperamide (Imodium).[2] Mechanisms of peripheral selectivity include physicochemical hydrophilicity and large molecular size, which prevent drug permeation through the lipid bilayer cell membranes of the blood–brain barrier, and efflux out of the brain by blood–brain barrier transporters such as P-glycoprotein among many others.[2][3][4] Transport out of the brain by P-glycoprotein is thought to be responsible for the peripheral selectivity of many drugs, including loperamide, domperidone, fexofenadine, bilastine, cetirizine, ivermectin, and dexamethasone, among others.[2][5][6][7][8]

Examples

References

  1. Stein, C; Zöllner, C (2009). "Opioids and Sensory Nerves". Sensory Nerves. Handbook of Experimental Pharmacology. 194. pp. 495–518. doi:10.1007/978-3-540-79090-7_14. ISBN 978-3-540-79089-1. 
  2. 2.0 2.1 2.2 "P-Glycoprotein, a gatekeeper in the blood-brain barrier". Adv Drug Deliv Rev 36 (2–3): 179–194. April 1999. doi:10.1016/s0169-409x(98)00085-4. PMID 10837715. 
  3. "The blood-brain barrier". J Neuroimmune Pharmacol 8 (4): 763–73. September 2013. doi:10.1007/s11481-013-9473-5. PMID 23740386. 
  4. "Brain-to-blood transporters for endogenous substrates and xenobiotics at the blood-brain barrier: an overview of biology and methodology". NeuroRx 2 (1): 63–72. January 2005. doi:10.1602/neurorx.2.1.63. PMID 15717058. 
  5. "P-glycoprotein in the blood-brain barrier of mice influences the brain penetration and pharmacological activity of many drugs". J Clin Invest 97 (11): 2517–24. June 1996. doi:10.1172/JCI118699. PMID 8647944. 
  6. "Why Dexamethasone Poorly Penetrates in Brain". Stress 2 (1): 13–20. October 1997. doi:10.3109/10253899709014734. PMID 9787252. 
  7. Church, Martin K. (2021). "Antihistamines". Urticaria and Angioedema. Springer International Publishing. pp. 153–165. doi:10.1007/978-3-030-84574-2_11. ISBN 978-3-030-84573-5. 
  8. "Why are second-generation H1-antihistamines minimally sedating?". Eur J Pharmacol 765: 100–6. October 2015. doi:10.1016/j.ejphar.2015.08.016. PMID 26291661. 

External links