Packaging and storage—
Preserve in well-closed containers.
Identification—
Crush several Tablets, and dissolve 1 g of the powder in 20 mL of 3 N hydrochloric acid: the solution responds to the tests for
Magnesium 
191
.
Disintegration 701:
10 minutes, simulated gastric fluid TS being substituted for water in the test.
Acid-neutralizing capacity 301—
Not less than 5 mEq of acid is consumed by the minimum single dose recommended in the labeling, and not less than the number of mEq calculated by the formula:
0.8(0.0343M),
in which 0.0343 is the theoretical acid-neutralizing capacity, in mEq, of Mg(OH)
2; and
M is the quantity, in mg, of Mg(OH)
2 in the specimen tested, based on the labeled quantity.
Assay—
Weigh and finely powder not fewer than 20 Tablets. Transfer an accurately weighed portion of the powder, equivalent to about 250 mg of magnesium hydroxide, to a 100-mL volumetric flask, and proceed as directed in the
Assay under
Milk of Magnesia beginning with “Dissolve in 10 mL of 3 N hydrochloric acid.”
