for oral solution packaged in single-unit containers: meets the requirements.

for oral solution packaged in multiple-unit containers: meets the requirements.

Diluent, Mobile phase, Standard preparation, and Chromatographic system— Proceed as directed in the Assay under Hyoscyamine Sulfate Injection.

Assay preparation— Transfer an accurately measured volume of Oral Solution, equivalent to about 0.5 mg of hyoscyamine sulfate, to a 100-mL volumetric flask, dilute with Diluent to volume, and mix. Pass an aliquot through a 0.45-µm filter, discarding the first 5 mL of the filtrate.

Procedure— Separately inject equal volumes (about 50 µL) of the Standard preparation and the Assay preparation into the chromatograph, record the chromatograms, and measure the area responses for the major peaks. Calculate the quantity, in mg, of hyoscyamine sulfate [(C17H23NO3)2·H2SO4·2H2O] in each mL of the Oral Solution taken by the formula: in which 1.053 is the ratio of the molecular weight of hydrated hyoscyamine sulfate to that of anhydrous hyoscyamine sulfate; C is defined under Standard preparation; V is the volume, in mL, of Oral Solution taken; and rU and rS are the peak responses obtained from the Assay preparation and the Standard preparation, respectively.