6533b7cffe1ef96bd1258566

RESEARCH PRODUCT

Antihistaminic and anticholinergic activities of mequitazine in comparison with clemizole

L. EstañFrancisco J. Morales-olivasInocencia Martínez-mirElena Rubio

subject

medicine.medical_specialtyDuodenummedicine.drug_classmedicine.medical_treatmentGuinea PigsPharmaceutical ScienceIn Vitro TechniquesBiologyParasympatholyticchemistry.chemical_compoundPhenothiazinesInternal medicinemedicineAnticholinergicAnimalsPotencyMequitazinePharmacologyParasympatholyticsMuscle SmoothRats Inbred StrainsAcetylcholineRatsClemizoleSchild regressionEndocrinologychemistryHistamine H1 AntagonistsBenzimidazolesAntihistamineHistamineHistamineMuscle Contractionmedicine.drug

description

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.

https://doi.org/10.1111/j.2042-7158.1988.tb05331.x