Use of a compound of general formula (I): ##STR1## wherein: R.sup.1 represents hydrogen, halogen, trifluoromethyl, nitro, hydroxy, C.sub.1-6 alkyl, C.sub.1-6 alkoxy, arylC.sub.1-6 alkoxy, --CO.sub.2 R.sup.4, --(CH.sub.2).sub.n CN, --(CH.sub.2).sub.n CONR.sup.5 R.sup.6, --(CH.sub.2).sub.n SO.sub.2 NR.sup.5 R.sup.6, C.sub.1-6 alkanoylamino (CH.sub.2).sub.n, or C.sub.1-6 alkylsulphonylamino (CH.sub.2).sub.n ;R.sup.4 represents hydrogen, C.sub.1-6 alkyl or arylC.sub.1-6 alkyl;R.sup.5 and R.sup.6 each independently represent hydrogen or C.sub.1-6 alkyl, or R.sup.5 and R.sup.6 together with the nitrogen atom to which they are attached form a ring;n represents 0, 1 or 2; andR.sup.2 and R.sup.3 each independently represent hydrogen, C.sub.1-6 alkyl or benzyl or together with the nitrogen atom to which they are attached form a pyrrolidino, piperidino or hexahydroazepino ring;or a physiologically acceptable salt thereof, in the manufacture of a medicament for the treatment of a condition where a 5-HT.sub.1 -like agonist is indicated, for example migraine. Novel compounds of formula (I), processes for preparing them and pharmaceutical compositions containing them are also described.