Abstract A series of azepino [2, 1-b] quinazolones (C-1–C-16) have been synthesized and evaluated for their antitussive activity using citric acid-induced cough model in Guinea pigs. The compounds C-1–C-16 caused notable decrease in cough frequency and increase in cough latency induced by citric acid. C-3 [2, 4-dibromo-7, 8, 9, 10-tetrahydroazepino [2, 1-b] quinazolin-12 (6H)-one] showed notable antitussive effect as compared with codeine (10 ...