Use of a compound for the manufacture of a medicament for the treatment of a bacterial infection provided that the bacterial infection is other than a Mycobacterial infection, said compound being a compound of Formula (Ia) or (Ib) a pharmaceutically acceptable acid or base addition salt thereof, a quaternary amine thereof, a stereochemically isomeric form thereof, a tautomeric form thereof or a N-oxide form thereof, wherein R1 is hydrogen, halo, haloalkyl, cyano, hydroxy, Ar, Het, alkyl, alkyloxy, alkylthio, alkyloxyalkyl, alkylthioalkyl, Ar-alkyl or di(Ar)alkyl； p is 1, 2 or 3； R2 is hydrogen； alkyl； hydroxy； mercapto； optionally substituted alkyloxy； alkyloxyalkyloxy； alkylthio； mono or di(alkyl)amino wherein alkyl may optionally be substituted； Ar； Het or a radical of formula R3 is alkyl, Ar, Ar-alkyl, Het or Het-alkyl； q is zero, 1, 2, 3 or 4； X is a direct bond or CH2； R4 and R5 each independently are hydrogen, alkyl or benzyl； or R4 and R5 may be taken together including the N to which they are attached； R6 is hydrogen or a radical of formula R7 is hydrogen, alkyl, Ar or Het； R8 is hydrogen or alkyl； R9 is oxo； or R8 and R9 together form the radical &mdash；CH&boxH；CH&mdash；N&boxH；； and R11 is as defined in the claims.
