PMID: 1049Nov 1, 1975

On the pharmacology of 9,10-dihydro-10-(1-methyl-4-piperidylidene)-9-anthrol (WA 335), a histamine and serotonin antagonist (author's transl)

G Engelhardt


The substance 9,10-dihydro-10-(1-methyl-4-piperidylidene)-9-anthrol (WA 335) was examined for its antagonistic effects against histamine and serotonin, for its atropine-like properties as well as for a series of other qualities in comparison with cyproheptadine and pimethixene. The anti-histamine and anti-serotonin activities of compound WA 335 on the smooth muscle and the capillary do not only exceed that of cyproheptadine but also that of pimethixene. WA 335 shows an extremely strong binding to histamine and serotonin receptors. In the dose range in which it causes already an antamine effect, its oral absorption is very good. The anti-anaphylactic effect is much stronger than that of cyproheptadine. Like pimethixene and cyproheptadine, WA 335 has no distinct antagonistic qualities against bradykinin. The anticholinergic effects of WA 335 are dependent on the test object. In examinations on the bronchus of the guinea pig and the pupil of the mouse, the atropine-like efficiency corresponds to that of cyproheptadine; it is stronger on the stimulated vagus of the cat and less efficient than cyproheptadine on the stomach of the rat. WA 335 has distinct central atropine-like properties. It possesses a strong surface anesthetic acti...Continue Reading

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