Dibenzazepine derivatives, pharmaceutical compositions containing them, and methods of use

A compound of formula I, ##STR29## wherein R.sub.1 is hydrogen, C.sub.1-4 -alkyl, C.sub.2-4 -alkyl substituted by cyano, C.sub.2-5 -hydroxyalkyl, C.sub.2-18 -alkanoyloxy-(C.sub.2-5)-alkyl, C.sub.7-9 -phenylalkyl, C.sub.3-6 -cycloalkyl or C.sub.4-7 -cycloalkylalkyl,

• R.sub.2 and R.sub.3 are independently of each other hydrogen, halogen, trifluoromethyl, C.sub.1-4 -alkyl, C.sub.1-4 -alkoxy or C.sub.1-4 -alkylthio, and
• Z is --O--, --S-- or --NR--, wherein R is hydrogen, C.sub.1-4 -alkyl, C.sub.3-5 -alkenyl, C.sub.7-9 -phenylalkyl, C.sub.3-6 -cycloalkyl or C.sub.4-7 -cycloalkylalkyl,
• in free base form or in pharmaceutically acceptable acid addition salt form.