The present invention is concerned with novel imidazoazepines of formula ##STR1## the pharmaceutically acceptable addition salts and stereochemically isomeric forms thereof, wherein each of the dotted lines independently represents an optional bond; --A--B-- is a radical of formula --X--CH.dbd.CH-- (a-1); --CH.dbd.CH--X-- (a-2); or --CH.dbd.CH-- CH.dbd.CH-- (a-3); X represents O, S or NR.sup.1 ; R.sup.1 represents hydrogen or C.sub.1-6 alkyl; -----Y is a radical of formula .dbd.O (b-1); --OH (b-2); or .dbd.N--OH (b-3); and L represents hydrogen, C.sub.1-4 alkylcarbonyl, C.sub.1-4 alkyloxycarbonyl, phenylcarbonyl, C.sub.1-6 alkyl or C.sub.1-6 alkyl substituted with C.sub.1-4 alkyloxycarbonyl, hydroxycarbonyl, aryl, aryloxy or a radical of formula ##STR2## --D--Z-- is --S--CH.dbd.CH--, --S--CH.sub.2 --CH.sub.2 --, --S--CH.sub.2 --CH.sub.2 --CH.sub.2 --, --CH.dbd.CH--CH.dbd.CH-- or --CH.sub.2 --CH.sub.2 --CH.sub.2 --CH.sub.2 --; and aryl is phenyl or phenyl substituted with halo, hydroxy or C.sub.1-4 alkyloxy. Compositions comprising said compounds, processes for preparing the same and the use of these compounds for treating allergic diseases.