Non-peptide compounds of formula (I) having activity as specific antagonists of bradykinin (BK) B2 receptor. The compounds are chemically characterized by the presence of an alpha, alpha-disubstituted amino acid at least one amino group, free or salified, or the corresponding ammonium quaternary salt. These BK receptor antagonists are a novel class of medicaments which can be used in all the disorders in which the receptors are involved.