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Key words: Antihistaminic, asthma, bronchodilator, drug likeness, property, pyrimidine
Asthma is primarily a complex, chronic inflammatory disease of the airways, which affects more than 300 million people worldwide, making it a serious global health problem . It is characterized by recurrent reverse obstruction of the airways, airway inflammation and bronchial hyper responsiveness to stimuli which are not in themselves noxious and which do not affect non-asthmatic subjects . Bronchial asthma results from a complex interplay between genetic and environmental factors . An asthmatic subject suffers from intermittent attacks of dyspnoea (difficulty in breathing), wheezing and cough. Epidemiological studies show that its occurrence has been on a rise in children and young adults since early 1970’s, with the greatest incidence in more industrialized and urbanized societies, worldwide[4,5]. Nearly 7-10% of the world population suffers from bronchial asthma and India alone has an estimated burden of more than 15 million patients .
Currently bronchodilators (anticholinergics, selective β2-adrenergic agonists, methylxanthines, antihistaminics) and antiinflammatory agents (inhaled steroids, leukotriene antagonists, mast cell stabilizers etc) are used in the treatment of asthma. Despite the availability of a wide range of drugs, asthma control is poor globally and especially in developing countries due to the underutilization of these agents in view of their cost and adverse drug reaction (ADR) profiles[8-10]. Moreover, the relief offered by these drugs is not only symptomatic but short-lived. Poorly controlled asthma is associated with significant morbidity, mortality and consequent socio-economic issues. Hence, there is a dire need to search for new, effective and safer remedies to treat bronchial asthma.
While reviewing the recent perspectives in the design of antiasthmatic agents, we observed that different angularly fused heterocyclic ring systems like imidazoquinolines, imidazonaphthyridines, thienopyrimidines, triazolothienopyrimidines, benzimidazolo -quinazolines, imidazoquinazolines, benzimidazolopyridopyrimidines, imidazothienopyrimidines and triazinoquinazolines are potentially useful compounds[12,13].
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"Lipinski’s Rule of Five and Drug Likeness Scores." 123HelpMe.com. 22 Jan 2020
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