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Comparison of the effects of cimetidine and ranitidine in histamine provocation tests in atopic asthma

  • Histamine in Cell Proliferation, Cancer and Clinical Studies
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Abstract

The effects of cimetidine and ranitidine on the bronchial reactivity in the group of 10 patients with atopic bronchial asthma are presented. The patients received 800 mg of cimetidine daily for 6 days and, after a three-day interval, 300 mg of ranitidine daily for a further 6 days. Bronchial reactivity to histamine was determined before the administration of each drug and on the third and sixth days of each course of treatment. A comparison of the effect of cimetidine and ranitidine on the bronchial reactivity of the same patients revealed that after 3 days' exposure to each of the two drugs, cimetidine enhanced bronchial reactivity to a statistically (p<0.05) greater extent than ranitidine. Bronchial reactivity was found to increase significantly after 6 days of treatment with each of the drugs but no statistically significant differences were noted on comparing the effect of these drugs. The results seem to indicate that H2 receptor antagonists may cause bronchoconstriction in some patients with bronchial asthma. The blocking effect depends on the type of the drug used and is connected with the chemical structure of the compounds.

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This work was supported by the Polish Academy of Science Grant No. 06.03.

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Hofman, J., Rutkowski, R. & Michalska, I. Comparison of the effects of cimetidine and ranitidine in histamine provocation tests in atopic asthma. Agents and Actions 27, 202–204 (1989). https://doi.org/10.1007/BF02222239

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