1,2,4,5-Tetrahydro-3H-2-benzazepin-3-ones

A composition having a beneficial activity on the mnemic processes and a protective activity against hypotoxic type aggressions comprising an effective amount for said uses of a 1,2,4,5-tetrahydro-3H-2-benzazepin-3-one having the formula ##STR35## wherein R.sub.1 is a hydrogen atom or phenyl,

• R.sub.2 is a hydrogen atom, straight-chain or branched-chain alkyl, alkenyl having 3 to 6 carbon atoms, alkanoyl having 1 to 4 carbon atoms, hydroxy alkyl, alkoxyalkyl, monoalkylaminoalkyl, dialkylaminoalkyl, cyanoalkyl, alkoxyacetyl carbamoylalkyl, acetamidoalkyl, alkoxycarbonylalkyl or (tetrahydro-2H-pyran-2-yloxy) alkyl, the terms alkyl and alkoxy, however used, either alone or as part of the definition of a more complex substituent, have 1 to 5 carbon atoms, except in the case of acetamidoalkyl, where alkyl has 2 to 5 carbon atoms,
• R.sub.4 is a hydrogen atom or alkyl having 1 to 4 carbon atoms,
• R.sub.5 is a hydrogen atom, alkyl having 1 to 4 carbon atoms or phenyl,
• R.sub.7 is a hydrogen or halogen atom or alkoxy having 1 to 4 carbon atoms,
• R.sub.8 is a hydrogen or halogen atom or an alkyl radical having 1 to 4 carbon atoms, at least one of the symbols R.sub.1 to R.sub.8 being other than a hyrogen atom, in admixture with a pharmaceutically acceptable solid or liquid carrier.