A pharmaceutical composition as a solid oral dosage form is described, comprising: i) a combination of two pharmacological active principles, dexketoprofen salt with an organic or inorganic base and tramadol salt with an organic or inorganic acid, wherein: the organic or inorganic base is selected in the group: trometamol, trimethylamine, dimethylamine, ethylamine, triethylamine, diethylamine, L-lysine, L-arginine, diethanolamine, sodium hydroxide, calcium hydroxide the organic or inorganic acid is selected in the group: hydrochloric, hydrobromic, phosphoric, sulfuric, methanesulfonic, benzenesulfonic, toluenesulfonic, acetic, propionic, malic, maleic, succinic, citric, L-tartaric, lactic, malonic, aspartic, glutamic; ii) microcrystalline cellulose as a filler; iii) a binder selected in the group: maize starch, pre-gelatinized maize starch, hypromellose or their mixtures; iv) pharmaceutically acceptable excipients.