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The drug hasantiarrhythmic properties, probably due to the presence of a quinuclidine nucleus in the molecule's core. It acts as acalcium channel blocker and influences the activity of potassium channels.[clarification needed] In children with cardiac arrhythmia, combination therapy with quifenadone and eitheramiodarone orpropafenone was found to be more effective than monotherapy with either amiodarone or propafenone.[4]
Quifenadine is a derivative of quinuclidylcarbinol, which reduces the effects of histamine on organs and systems. Quifenadine is a competitive blocker of H1 receptors. In addition, it activates the diamine oxidase enzyme, which breaks down about 30% of endogenous histamine. This explains the effectiveness of quifenadine in patients insensitive to other antihistamines. The antihistaminic qualities of quifenadine are associated with the presence of a cyclic quinuclidine core in the structure and the distance between the diphenylcarbinol group and the nitrogen atom. In terms of antihistaminic activity and duration of action, quifenadine is superior to diphenhydramine. Quifenadine reduces the toxic effect of histamine, eliminates or weakens its bronchoconstrictor effect and spasmodic effect on the smooth muscles of the intestines, has a moderate antiserotonin and weak cholinolytic effect, has well-defined antipruritic and desensitizing properties. Quifenadine weakens the hypotensive effect of histamine and its effect on capillary permeability, does not directly affect cardiac activity and blood pressure, does not have a protective effect in aconitine arrhythmias.[5]
^Makarov L, Balykova L, Soldatova O, Komolyatova V, Serebruany V (2010). "The antiarrhythmic properties of quifenadine, H1-histamine receptor blocker in children with premature beats: a randomized controlled pilot trial".American Journal of Therapeutics.17 (4):396–401.doi:10.1097/MJT.0b013e3181a86987.PMID19487925.S2CID43654011.
