Novel 3,7-diaza bicyclo-(3,3,1)-nonane compounds are described which are represented by the formula: ##STR1## wherein Z.sub.1 and Z.sub.2 each denotes hydrogen,R.sub.1 and R.sub.2 each denotes (A) a substituent which contains up to 12 carbon atoms and which is selected from the group consisting of alkyl, alkenyl, and alkinyl, or (B) a cycloalkyl group containing 3 to 6 carbon atoms which is attached to the nitrogen atom directly or by an alkylene group containing 1 to 3 carbon atoms, andR.sub.3 and R.sub.4 each denotes an alkyl group with up to 7 carbon atoms, or both together form an alkylene chain represented by the formula --(CH.sub.2).sub.n --, wherein n is an integer ranging between about 3 and 6, such that the substituents R.sub.1, R.sub.2, R.sub.3, and R.sub.4 together contain at least 5 carbon atoms. Also described are processes of producing said compounds, pharmaceutical compositions containing compounds of Formula I, and methods of preparing and using said compositions.