Aqueous liquid pharmaceutical composition comprising a) almotriptan and b) at least one compound selected from i) 1'-methyl-5-((pyrrolidin-1-ylsulfonyl)methyl)spiro[indoline-3,3'-pyrrolidin]-2-ol, and ii) 3-(2-(dimethylamino)ethyl)-5-((pyrrolidin-1-ylsulfonyl)methyl)-1H-indol-2-ol.

A method for the preparation and purification of the substance of formula (I) i.e. 3-[2-(dimethylamino)ethyl]-5-(1-pyrrolidinylsulfonylmethyl)-1H-indole which comprises: (a) conversion of 4-(1-pyrrolidinylsulfonylmethyl)phenylhydrazine of formula (III) by reaction with an organic or inorganic acid to a salt that is insoluble or poorly soluble in water which is converted to 3-(2-aminoethyl)-5-(1-pyrrolidinylsulfonylmethyl)indole of formula (VII) which is further converted without isolation to a s...