Stable pharmaceutical product and vessel comprising sodium picosulfate, magnesium oxide and citric acid

1. A stable oral liquid pharmaceutical product comprising:

sodium picosulfate, and

a combination of magnesium oxide and citric acid,

wherein the sodium picosulfate is physically separated from the combination of magnesium oxide and citric acid in a two-compartment vessel, which holds a sodium picosulfate solution in a first compartment and a magnesium oxide and citric acid solution in a second compartment, wherein the vessel permits the components of the first and second compartments to be dispensed together simultaneously as a liquid solution, and

wherein the first and second compartments do not include malic acid.

2. The pharmaceutical product of claim 1 , comprising a (4-[(Pyridin-2-yl) (4-hydroxyphenyl)methyl] phenyl sodium sulfate impurity in an amount of less than 0.5% after storage for three months at 40° C.

3. The pharmaceutical product of claim 1 , further comprising one or more pharmaceutically acceptable excipients selected from alkalizing agents, preservatives, stabilizers, antioxidants, buffering agents, sweeteners and flavoring agents.

4. A vessel comprising the first compartment and the second compartment of claim 1 .

5. The vessel of claim 4 , wherein the vessel further comprises a lid separately sealing the first and second compartments.

6. The vessel of claim 4 , wherein the first and/or second compartment further comprises one or more pharmaceutically acceptable excipients selected from alkalizing agents, preservatives, stabilizers, antioxidants, buffering agents, sweeteners and flavoring agents.

7. A method of cleansing the colon of a subject as a preparation for colonoscopy, comprising administering the dispensed composition of claim 1 .