Phenothiazine cytokine inhibitors

A compound selected from those of formula (I):

• ##STR41## in which v represents 1 to 4 inclusive, R.sub.a and x are as defined above, Q represents halogen, and each of R.sub.b and R'.sub.b, independently of the other, represents alkyl having 1 to 5 carbon atoms inclusive in a straight or branched chain, optionally substituted aryl, or optionally substituted arylalkyl,
• it being understood that unless otherwise specified, "aryl radical" represents a radical chosen from phenyl and naphthyl, and "arylalkyl radical" represents a radical chosen from phenyl and naphthyl bound to an alkyl radical containing 1 to 4 carbon atoms, inclusive,
• it being also understood that, unless otherwise specified, the expression "optionally substituted" means that the alkyl, aryl, or arylalkyl group may be substituted by one or more substituents chosen from halogen, hydroxy nitro, cyano, alkyl, alkoxy, haloalkyl, amino, alkylamino and dialkylamino,
• and their possible stereoisomers, epimers, N-oxides and pharmaceutically-acceptable acid or base addition salts.