Pharmaceutical dosage unit compositions containing as an active ingredient a compound of the formula ##SPC1##WhereinR.sub.1 and R.sub.2, which may be identical to or different from each other, are each hydrogen, cycloalkyl, phenyl, --A--YwhereinA is alkyl of 1 to 5 carbon atoms or alkenyl of 1 to 5 carbon atoms, andY is furyl, dialkylamino, hydroxyl, carbalkoxy or carbamido,Or, together with each other and the nitrogen atom to which they are attached, pyrrolidino, piperidino, hexamethyleneimino, morpholino, thiomorpholino, thiomorpholino-S-oxide or N'-alkylpiperazino,R.sub.3 is halogen, nitro or trifluoromethyl,R.sub.4 is hydrogen, halogen or trifluoromethyl, andR.sub.5 is hydrogen, alkyl, cycloalkyl-methyl, alkylamino-alkyl, dialkylamino-alkyl or trifluoromethyl-alkyl;And a method of using the same as sedatives, tranquilizers, muscle-relaxants and anticonvulsives.