[A comparative pharmacologic study of histamine H-1 antagonists]

In a representative group of 10 conventional antihistaminic agents, a comparison of their H1-antagonistic efficacy was carried out in a series of pharmacological tests. A very good correlation of findings obtained under in vivo conditions in guinea-pigs (tests of detoxication of histamine and histamine aerosol) and a test in rats, which examined the influence on local changes induced by histamine in the dermal region, was demonstrated. No statistically significant correlation of in vivo findings and receptor binding studies on membranes of the rat brain (displacement of (3H)-mepyramine) was found. The tests based on displacement of (3H)-mepyramine are usable primarily for the needs of screening research. The predictive value of pharmacological findings obtained under in vivo conditions is substantially higher.