Abstract: Novel and known dibenzimidazoles of the formula ##STR1## wherein R.sup.1 and R.sup.2 can be the same or different and signify C.sub.6 H.sub.4 R.sup.3 --, C.sub.6 H.sub.3 (OH)R.sup.4 -- or heterocyclyl,R.sup.3 signifies hydroxy, amino, lower alkoxy or cyano andR.sup.4 signifies halogen, lower alkyl or lower alkoxy,as well as pharmaceutically usable salts of compounds of general formula I are antibacterials, especially against Staphylococcus, Enterococcus and Heliobacter pylori.

Abstract: Disclosed are N,N'-bis(quinolin-4-yl)diamine derivatives of general formula I wherein R.sup.1 signifies halogen or trifluoromethyl, R.sup.2 signifies hydrogen or halogen, A signifies cyclohexane-1,3-diyl, 2-methyl-cyclohexane-1,3-diyl, cyclohexane-1,4-diyl, dicyclohexylmethane-4,4'-diyl, cyclopentane-1,3-diyl, phenylene-1,4, phenylene-1,3 and phenylene-1,2; n is 1 or 2; m is 1 or 2, as well as their pharmaceutically acceptable salts. These products are useful as agents for preventing malaria and for treating it, especially where the pathogens are resistant to chloroquine.