Astra Lakemedel Aktiebolag

Sven-Ove Gren

Ulf H Lindberg

A method for treatment of senile dementia comprising administration to a patient of a therapeutically effective amount of a compound of the formula ##STR1## and pharmaceutically acceptable salts thereof, in which formula the groups R.sup.0 are the same or different and are selected from the group consisting of hydrogen, halogen, alkyl having 1, 2 or 3 carbon atoms, and alkoxy having 1, 2 or 3 carbon atoms; R.sup.1 is hydrogen, methyl or ethyl; R.sup.2 is methyl or ethyl; R.sup.3 and R.sup.4 are the same or different and are hydrogen or an alkyl group having 1, 2 or 3 carbon atoms; and n is 0, 1 or 2.

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Nykvarn, Sweden

Sven-Ove Gren