wide variety of non toxic pharmaceutically acceptable addition salts the following numbering system is used to identify positions on the dibenzofuran ring portion of the compounds of the invention str12 by 34 alkyl 34 and 34 lower alkyl 34 is meant straight and branched chain alkyl groups having from 1 6 carbon atoms e g c 1 c 6 alkyl by 34 lower alkoxy 34 and 34 alkoxy 34 is meant straight and branched chain alkoxy groups having from 1 6 carbon atoms e g c 1 c 6 alkoxy the amino portion of the aminoalkyl group represented by r above includes groups represented by the formula q str13 where w is defined above th formula q represents saturated heterocyclic ring systems such as for example piperidinyl and piperazinyl as well as unsaturated heterocyclic ring systems such as for example 1 2 3 6 tetrahydropyrindine preferred q groups are the following str14 where w is defined above particularly preferred w groups of the invention are a quinolinyl more preferably 8 quinolinyl b naphthyl or c phenyl optionally substituted with up to two substituents independently selected from halogen c 1 c 4 alkyl and c 1 c 4 alkoxy these optional phenyl substituents are preferably in the 2 and or 3 positions of the phenyl group relative to the point of attachment of the phenyl group to the 6 membered nitrogen containing ring representative examples of n aminoalkyldibenzothiophenecarboxamides according to the invention are shown in table 1 below the number below each compound is its compound number each of these compounds may be prepared according to the general reaction scheme i set forth below compounds 1.