• Histamine in inflammation and allergic
diseases play an important role in physi -ological, histamine of proinflammatory and immune adjustment is by three kind -s of histamine H1,H2, H3.
7.Indications:
Oral treatment: Allergic rhinitis, skin irritations, pleomorphic exudative erythema and urticaria Eye drops:Allergic conjunctivitis Dosage form: Tablets:5 mg/tablet Eye drops:1% eye drops
• The advantages of second generation
antiallergic:
• (1)better clinical curative effect • (2)long-term effect • (3)no side effect to central nervous
system
development of pharmacology, antihistamines have been developed to six categories nearly hundred kinds of varieties.
The first generation of antiallergic drug
8.Synthetic route:
According to the chemical structural formula and inverse synthetic analysis, a reasonable mode of fracture in the double bond, by carbonyl build double bond.