Patent ID: 7147868

Claim:
An antacid and laxative tablet comprising magnesium oxide particles as an effective component, wherein (i) the magnesium oxide particles contained in the tablet have an average secondary particle diameter measured by a laser diffraction scattering method of 0.5 to 10 μm, (ii) the content of magnesium oxide particles in the tablet is 88 to 97 wt %, (iii) the tablet does not become blackish and has substantially no tableting spot, (iv) the disintegration time is 10 second or less, (v) the magnesium oxide particles are obtained by baking magnesium hydroxide particles having an average secondary particle diameter of 1 to 10 μm measured by a laser diffraction scattering method at 700 to 1000° C., (vi) the tablet contains 1 to 10 wt % of crystalline cellulose or starch as a binder, (vii) the tablet contains 1 to 3.5 wt % of at least one selected from the group consisting of crosscarmerose sodium, carmerose calcium, and carboxy starch sodium as a disintegrator, (viii) the tablet is formed from granulated magnesium oxide particles having an average particle diameter of 0.25 to 0.40 mm, and (ix) the tablet is formed from granulated magnesium oxide particles having a repose angle of 35 to 43°.