Pharmacological study of ebastine, a novel histamine H1-receptor antagonist
| Autor: | Katsumi Ishii, Ikuhisa Yakuo, Kunihiko Takeyama, Tadahiko Karasawa, Hideo Nakamura, Yasuhiro Seto, Kiyomi Imano |
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| Rok vydání: | 1994 |
| Předmět: |
Male
Ketotifen Ebastine Metabolite medicine.medical_treatment Guinea Pigs Administration Oral Histamine H1 receptor In Vitro Techniques Pharmacology Histamine Release chemistry.chemical_compound Piperidines Phenothiazines Hypersensitivity medicine Animals Humans Terfenadine Rats Wistar Mequitazine Pyrilamine Dose-Response Relationship Drug Butyrophenones Rats Disease Models Animal chemistry Histamine H1 Antagonists Antihistamine Histamine medicine.drug |
| Zdroj: | Folia Pharmacologica Japonica. 103:121-135 |
| ISSN: | 1347-8397 0015-5691 |
| Popis: | The anti-allergic activity of ebastine, a novel antihistamine, was assessed in comparison with several antihistamines. 1) Orally administered ebastine dose-dependently inhibited 7-day homologous passive cutaneous anaphylaxis (PCA), experimental allergic rhinitis and experimental asthma in guinea pigs or rats (ED50-values were 2.17, 0.29 and 0.35 mg/kg, respectively); and its anti-allergic activity was more potent than those of terfenadine and mequitazine. Moreover, its PCA-inhibitory activity was still observed 24 hr after the administration. 2) Orally administered ebastine also inhibited histamine-induced skin reaction in rats (ED50: 1.10 mg/kg). 3) In isolated guinea pig trachea, ebastine had no effect on histamine-induced contraction, but carebastine, a main metabolite of ebastine, inhibited this contraction (IC50: 0.12 microM). 4) Carebastine (30-100 microM) suppressed the histamine release from rat peritoneal mast cells and human basophils. 5) Ebastine at a high oral dose showed slight inhibition of the specific binding of 3H-mepyramine to the histamine H1-receptor in rat brain. This binding-inhibitory activity of ebastine was little more potent than that of terfenadine, but much less potent than those of mequitazine and ketotifen. These results indicated that ebastine has potent and long acting anti-allergic activity with few side effects based on the antihistaminic activity in the central nervous system. Furthermore, it was suggested that these effects of ebastine are due to the action of a main metabolite, carebastine. |
| Databáze: | OpenAIRE |
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