Serotoninergic ergoline derivatives

A compound of the formula (I) ##STR9## wherein A represents OH, NH.sub.2, COOR'.sub.3, OCONHR.sub.4, CONHR.sub.4, NHCOR.sub.4, NHCO.sub.2 R.sub.4, NHC(X)NHR.sub.4, NHC(X)NHCOR.sub.4, ##STR10## R.sub.1 is hydrogen or C.sub.1-4 linear or branched alkyl;

• R.sub.2 is hydrogen, chlorine, bromine or an S--C.sub.1-4 alkyl group;
• R.sub.3 and R.sub.3 ' are, independently, C.sub.1-5 alkyl or hydrogen, n is 0, 1 or 2, m is 1 or 2;
• R.sub.4 is hydrogen, C.sub.1-7 alkyl, C.sub.3-7 cycloalkyl, adamantidyl (tricyclo 3.3.1.1..sup.3,7) decan-1-yl, C.sub.1-5 -alkylphenyl, C.sub.2 -alkenyl-phenyl;
• C.sub.2 -alkynyl-phenyl, phenyl optionally substituted by one or more groups selected from C.sub.1-4 alkyl, C.sub.1-3 alkoxy, methylendioxy, cyano, trifluoromethyl, hydroxy, nitro and acetyl;
• a heterocyclic group selected from the group consisting of pyridyl, pyrazolyl, thiazolyl, pyrazinyl, pyrmidinyl, pyridazinyl, furyl and pyrrolyl, each of which is optionally substituted by a group selected from C.sub.1-4 alkyl, phenyl optionally substituted as defined above, C.sub.1-3 alkoxy and halogen;
• R.sub.5 is hydrogen, C.sub.1-4 alkyl or a phenyl group and X is NH, O, or S;
• or a pharmaceutically acceptable salt thereof.