This invention relates to 3-substituted-1,5-diaryl-2-alkyl-pyrroles of Formula I, pharmaceutical compositions containing them, and to their use for the pharmacological treatment of pain and COX-2 over-activation associated disorders. Compounds of this invention are new pyrrole derivatives bearing in position -3 of the pyrrole ring, several variously functionalized, not aliphatic, side chains which confer to the compounds a relevant COX-2 potency and selectivity along with a remarkable oral efficacy. Phenyl rings in position -1 and -5 are variously substituted, but compounds of particular interest are those substituted in position -5 with 4-methylsulphonyl-phenyl or with 4-aminosulphonyl-phenyl groups.