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RESEARCH PRODUCT
Antihistaminic and anticholinergic activities of mequitazine in comparison with clemizole
L. EstañFrancisco J. Morales-olivasInocencia Martínez-mirElena Rubiosubject
medicine.medical_specialtyDuodenummedicine.drug_classmedicine.medical_treatmentGuinea PigsPharmaceutical ScienceIn Vitro TechniquesBiologyParasympatholyticchemistry.chemical_compoundPhenothiazinesInternal medicinemedicineAnticholinergicAnimalsPotencyMequitazinePharmacologyParasympatholyticsMuscle SmoothRats Inbred StrainsAcetylcholineRatsClemizoleSchild regressionEndocrinologychemistryHistamine H1 AntagonistsBenzimidazolesAntihistamineHistamineHistamineMuscle Contractionmedicine.drugdescription
Abstract The antihistamine and anticholinergic properties of mequitazine have been investigated and compared with those of clemizole. Both mequitazine and clemizole antagonized the effect of histamine in guinea-pig ileum competitively, the pA2 values calculated by Schild plot were 9.95 ± 0.44 for mequitazine and 10.54 ± 0.44 for clemizole. Mequitazine at 10−7 M produced a parallel shift of the dose-response curve to acetylcholine in the rat duodenum, clemizole and the lower doses of mequitazine failed to modify the effect of acetylcholine. The potency of mequitazine and clemizole as H1-histamine blockers is similar, but only mequitazine at highest concentration used showed anticholinergic activity.
year | journal | country | edition | language |
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1988-09-01 | Journal of Pharmacy and Pharmacology |