Cough-induced activity of (-)-(2S, 3aR, 7aS)-1-[(S)-N-[(S)-1-ethoxycarbonyl-3- phenylpropyl]alanyl]hexahydro-2-indolinecarboxylic acid (trandolapril) in guinea pigs.

We examined the effect of trandolapril ((-)-(2S, 3aR, 7aS)-1-[(S)-N-[(S)-1-ethoxycarbonyl-3- phenylpropyl]alanyl]hexahydro-2-indolinecarboxylic acid), a potent angiotensin converting enzyme (ACE) inhibitor, on the number of capsaicin-induced coughs in guinea pigs and compared it with that of enalapril. Chronic treatment with enalapril, at a dose of 3 mg/kg, p.o., significantly enhanced the number of capsaicin-induced coughs. Chronic treatment with trandolapril, at doses of 1 and 3 mg/kg, p.o., slightly enhanced the number of capsaicin-induced coughs. However, there were no significant differences in the number of capsaicin-induced coughs between trandolapril-treated and vehicle-treated animals. These results suggest that cough induced activity, one of the most serious side effects associated with chronic treatment with ACE inhibitors, of trandolapril is relatively lower than that of enalapril.