A stabilized pharmaceutical composition comprising a non-peptide pharmaceutically active ingredient, an excipient and an acidic compound as a stabilizer, wherein the non-peptide pharmaceutically active ingredient is 1- {5- (2-fluorophenyl) -1 - [(6-methylpyridine -3-yl)) sulfonyl] -1H-pyrrol-3-yl} -N-methylmethanamine or one of its salts, 1- [4-fluoro-5-phenyl-1- (pyridin-3-ylsulfonyl) -1H- pyrrol-3-yl] -N-methylmethanamine or one of its salts, N-5 methyl-1- [5- (4-methyl-3-thienyl) -1- (pyridin-3-ylsulfonyl) -1H-pyrrole- 3-yl] methanamine or one of its salts, 1- [5- (2-fluorophenyl) -1- (pyridin-3-ylsulfonyl) -1H-pyrrol-3- yl] -N-methylmethanamine or one of its salts, N-methyl-1- [5- (2-methylphenyl) -1- (pyridin-3-ylsulfonyl) -1H-pyrrol-3-yl] methanamine or one of its salts, or 1- [4-fluoro-5- (2-fluoropyridin-3-yl) -1- (pyridin-3-ylsulfonyl) -1H-pyrrol-3-yl] -N-methylmethanamine or one of its salts, and wherein the acidic compound is fumaric acid.Una composición farmacéutica estabilizada que comprende un principio farmacéuticamente activo no peptídico, un excipiente y un compuesto ácido como estabilizador, en el que el principio farmacéuticamente activo no peptídico es 1-{5-(2-fluorofenil)-1-[(6-metilpiridin-3-il))sulfonil]-1H-pirrol-3-il}-N-metilmetanamina o una de sus sales, 1-[4-fluoro- 5-fenil-1-(piridin-3-ilsulfonil)-1H-pirrol-3-il]-N-metilmetanamina o una de sus sales, N-5 metil-1-[5-(4-metil-3-tienil)-1- (piridin-3-ilsulfonil)-1H-pirrol-3-il]metanamina o una de sus sales, 1-[5-(2-fluorofenil)-1-(piridin-3-ilsulfonil)-1H-pirrol-3- il]-N-metilmetanamina o una de sus sales, N-metil-1-[5-(2-metilfenil)-1-(piridin-3-ilsulfonil)-1H-pirrol-3-il]metanamina o una de sus sales, o 1-[4-fluoro-5-(2-fluoropiridin-3-il)-1-(piridin-3-ilsulfonil)-1H-pirrol-3-il]-N-metilmetanamina o una de sus sales, y en donde el compuesto ácido es ácido fumárico.
