Pharmacokinetic studies of Perindopril (4 mg) and Cilazapril (2.5 mg) conventional formulations marketed in India and abroad respectively was carried out on eight healthy male volunteers. Plasma samples were analysed by using indirect method of Angiotensin I radio-immunoassary method (RIA). Pharmacokinetic parameters such as Tmax, Cmax, Kel, AUC and T1/2 were determined and subjected to statistical analysis. During the study, no undesirable side effects were observed in any of the volunteers.