This invention discloses and claims diary heterocycles of formula (I) ##STR00001## and their pharmaceutically acceptable salts, pharmaceutical compositions thereof, and methods of using said compounds of formula (I) for the treatment or prevention of excessive weight or obesity, and for treatment of Type II diabetes, arteriosclerosis, high blood pressure, depression, anxiety, anxiety neuroses, and schizophrenia. Methods for treatment of excessive weight or obesity and for treatment of Type II diabetes with a mixture of a compound of formula I and antiobesity agents or appetite-regulating active ingredients, or with a mixture of a compound of formula I and antidiabetics or hypoglycemic active ingredients are also disclosed and claimed.