Phytopharmacological evaluation of aerial parts of Woodfordia fruticosa (L.) Kurz in Cough Variant Asthma

Abstract:

Background: Cough variant asthma (CVA) is characterized by prolonged non productive cough which responds to bronchodilator therapy. None of herbal drug is reported to possess pharmacological activity against CVA. Objective: To investigate the pharmacological potential of ethanolic extract of Woodfordia fruticosa (L.) Kurz (EEWF) against CVA as well as to develop an efficient screening model for CVA. Material and Method: Antitussive effect of EEWF was evaluated against nebulized aqueous solution of 0.1 g/ml of citric acid to determine the cough response. EEWF potential was finally accessed against aerosolic mixture of 0.3 g/ml of citric acid mixed with 0.1% histamine and 2% acetylcholine chloride to evaluate the convulsive latency, percentage protection and cough frequency against CVA. Results: EEWF at aerosolic dose of 6% w/v exhibit decrease in of the average coughs frequency (4.83±0.30) which is quite significant effect as compared to standard drug codeine. EEWF against aerosol induced CVA was found to exhibit a significant bronchoprotection of 41.75% and decreases number of coughs (7.16±0.47) at 200 mg/kg as compared to control (14.16±0.60). Conclusion: EEWF at 200 mg/kg dose exhibited bronchoprotective and antitussive effects against aerosol induced CVA.

Keywords: Acetylcholine, Antitussive, Bronchoprotection, Citric acid, Cough, Cough variant asthma (CVA), Ethanolic extract of Woodfordia fruticosa (L.) Kurz (EEWF), Histamine.