A pharmaceutical composition for oral administration, wherein taste of the pharmaceutically active ingredient is masked, prepared by wet granulation of a mixture of a pharmaceutically active ingredient, at least one compound selected from the group consisting of magnesium aluminometasilicate and calcium silicate, and a pharmacologically acceptable carrier, and a method of preparing the pharmaceutical composition. The oral pharmaceutical composition may be prepared without using a costly special manufacturing system or additive, have an off-taste masking effect on active ingredients, and exhibit an appropriate drug dissolution behavior in the body for manifestation of pharmaceutical effect. Also, the oral pharmaceutical composition is compatible with both a water-soluble active ingredient and a poorly water-soluble active ingredient, with high industrial applicability due to simple manufacturing processes and high economical efficiency and productivity. The oral pharmaceutical composition may be formulated in any of a variety of solid dosage forms with improved pharmaceutical characteristics.
