An N-amino alkyl indole compound of Formula I ##STR9## in which R.sub.1 indicates the hydrogen atom, an alkyl group with 1 to 4 carbon atoms, a phenyl substituted alkyl group with 1 to 4 alkyl carbon atoms, or an acetyl group;
- R.sub.2 indicates the hydroxy carbonyl group, an alkoxy carbonyl group with 1 to 4 alkyl carbon atoms, the cyano group, an amino carbonyl group, or a mono- or di-alkyl amino carbonyl group with 1 to 4 alkyl carbon atoms, with the provise that when R.sub.2 is the hydroxy carbonyl group, then R.sub.1 must be another substituent than the hydrogen atom;
- A indicates an alkylene group with 2 to 5 carbon atoms;
- R.sub.3 and R.sub.4 are the same or different substituents and indicate the hydrogen atom, an alkyl group with 1 to 4 carbon atoms, or R.sub.3 and R.sub.4 being an alkylene group and forming together with the nitrogen atom to which they are attached, a heterocyclic ring with 5 to 7 ring members;
- and
- R.sub.5 and R.sub.6 are same or different and indicate the hydrogen atom, a halogen atom, an alkyl group with 1 to 3 carbon atoms, an alkoxy group with 1 to 3 carbon atoms, or one of the substituents R.sub.5 and R.sub.6 being the trifluoro methyl group or the nitro group while the other one indicates the hydrogen atom;
- and the pharmaceutically acceptable acid addition salts of said indole compounds.