Sodium Sulfate Anhydrous, Potassium Sulfate, and Magnesium Sulfate

Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution is indicated for cleansing of the colon as a preparation for colonoscopy in adult patients. Pediatric use information is approved for Braintree Laboratories, Inc.'s SUPREPP® BOWEL PREP KIT (sodium sulfate, potassium sulfate, and magnesium sulfate) oral solution. However, due to Braintree Laboratories, Inc.'s marketing exclusivity rights, this drug product is not labeled with that pediatric information. Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution is an osmotic laxative indicated for cleansing of the colon in preparation for colonoscopy in adult patients. ( 1 )

Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution (for adults): Two bottles each containing 6 ounces of an oral solution of 17.5 grams sodium sulfate, 3.13 grams potassium sulfate, and 1.6 grams magnesium sulfate as a clear to slightly hazy liquid. When diluted as directed, the solution is clear and colorless. Pediatric use information is approved for Braintree Laboratories, Inc.'s SUPREP BOWEL PREP KIT (sodium sulfate, potassium sulfate, and magnesium sulfate) oral solution. However, due to Braintree Laboratories, Inc.'s marketing exclusivity rights, this drug product is not labeled with that pediatric information. Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution (for adults): Two bottles each containing 6 ounces of an oral solution of 17.5 grams sodium sulfate, 3.13 grams potassium sulfate, and 1.6 grams magnesium sulfate. ( 3 )

Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution is contraindicated in the following conditions: Gastrointestinal obstruction or ileus [see Warnings and Precaution (5.6) ] Bowel perforation [see Warnings and Precautions (5.6) ] Toxic colitis or toxic megacolon Gastric retention Hypersensitivity to any of the ingredients in sodium sulfate, potassium sulfate, and magnesium sulfate oral solution [see Warnings and Precautions (5.8) and Description (11)] Gastrointestinal obstruction or ileus ( 4 , 5.6 ) Bowel perforation ( 4 , 5.6 ) Toxic colitis or toxic megacolon ( 4 ) Gastric retention ( 4 ) Hypersensitivity to any ingredient ( 4 , 5.8)

Risk of fluid and electrolyte abnormalities: Encourage adequate hydration, assess concurrent medications, and consider laboratory assessments prior to and after each use. ( 5.1 , 7.1 ) Cardiac arrhythmias: Consider pre-dose and post-colonoscopy ECGs in patients at increased risk. ( 5.2 ) Seizures: Use caution in patients with a history of seizures and patients at increased risk of seizures, including medications that lower the seizure threshold. ( 5.3 , 7.1 ) Patients with renal impairment or taking concomitant medications that affect renal function: Use caution, ensure adequate hydration and consider laboratory testing. ( 5.4 , 7.1 ) Suspected GI obstruction or perforation: Rule out the diagnosis before administration. ( 4 , 5.6 ) Patients at risk for aspiration: Observe during administration. ( 5.7 ) Hypersensitivity reactions, including anaphylaxis: Inform patients to seek immediate medical care if symptoms occur. (5.8)

5.1 Serious Fluid and Serum Chemistry Abnormalities Advise all patients to hydrate adequately before, during, and after the use of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution. If a patient develops significant vomiting or signs of dehydration after taking sodium sulfate, potassium sulfate, and magnesium sulfate oral solution consider performing post-colonoscopy lab tests (electrolytes, creatinine, and BUN). Fluid and electrolyte disturbances can lead to serious adverse events including cardiac arrhythmias, seizures and renal impairment. Correct fluid and electrolyte abnormalities before treatment with sodium sulfate, potassium sulfate, and magnesium sulfate oral solution. Use sodium sulfate, potassium sulfate, and magnesium sulfate oral solution with caution in patients with conditions, or who are using medications, that increase the risk for fluid and electrolyte disturbances or may increase the risk of adverse events of seizure, arrhythmias, and renal impairment [see Drug Interactions (7.1) ] . Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution can cause temporary elevations in uric acid [see Adverse Reactions (6.1) ] . Uric acid fluctuations in patients with gout may precipitate an acute flare. The potential for uric acid elevation should be considered before administering sodium sulfate, potassium sulfate, and magnesium sulfate oral solution to patients with gout or other disorders of uric acid metabolism.

5.2 Cardiac Arrhythmias There have been rare reports of serious arrhythmias associated with the use of ionic osmotic laxative products for bowel preparation. Use caution when prescribing sodium sulfate, potassium sulfate, and magnesium sulfate oral solution for patients at increased risk of arrhythmias (e.g., patients with a history of prolonged QT, uncontrolled arrhythmias, recent myocardial infarction, unstable angina, congestive heart failure, or cardiomyopathy). Consider pre-dose and post-colonoscopy ECGs in patients at increased risk of serious cardiac arrhythmias.

5.3 Seizures There have been reports of generalized tonic-clonic seizures and/or loss of consciousness associated with use of bowel preparation products in patients with no prior history of seizures. The seizure cases were associated with electrolyte abnormalities (e.g., hyponatremia, hypokalemia, hypocalcemia, and hypomagnesemia) and low serum osmolality. The neurologic abnormalities resolved with correction of fluid and electrolyte abnormalities. Use caution when prescribing sodium sulfate, potassium sulfate, and magnesium sulfate oral solution for patients with a history of seizures and in patients at increased risk of seizure, such as patients taking medications that lower the seizure threshold (e.g., tricyclic antidepressants), patients withdrawing from alcohol or benzodiazepines, or patients with known or suspected hyponatremia [see Drug Interactions (7.1) ] .

5.4 Use in Patients with Risk of Renal Injury Use sodium sulfate, potassium sulfate, and magnesium sulfate oral solution with caution in patients with impaired renal function or patients taking concomitant medications that may affect renal function (such as diuretics, angiotensin converting enzyme inhibitors, angiotensin receptor blockers, or non-steroidal anti-inflammatory drugs) [see Drug Interactions (7.1) ] . These patients may be at risk for renal injury. Advise these patients of the importance of adequate hydration with sodium sulfate, potassium sulfate, and magnesium sulfate oral solution and consider performing baseline and post-colonoscopy laboratory tests (electrolytes, creatinine, and BUN) in these patients [see Use in Specific Populations (8.6) ] .

5.5 Colonic Mucosal Ulcerations and Ischemic Colitis Osmotic laxative products may produce colonic mucosal aphthous ulcerations, and there have been reports of more serious cases of ischemic colitis requiring hospitalization. Concurrent use of stimulant laxatives and sodium sulfate, potassium sulfate, and magnesium sulfate oral solution may increase these risks [see Drug Interactions (7.3) ] . Consider the potential for mucosal ulcerations resulting from the bowel preparation when interpreting colonoscopy findings in patients with known or suspect inflammatory bowel disease (IBD).

5.6 Use in Patients with Significant Gastrointestinal Disease If gastrointestinal obstruction or perforation is suspected, perform appropriate diagnostic studies to rule out these conditions before administering sodium sulfate, potassium sulfate, and magnesium sulfate oral solution [see Contraindications (4) ] . Use with caution in patients with severe active ulcerative colitis.

5.7 Aspiration Patients with impaired gag reflex or other swallowing abnormalities are at risk for regurgitation or aspiration of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution. Observe these patients during administration of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution. Use with caution in these patients.

5.8 Hypersensitivity Reactions Serious hypersensitivity reactions, including anaphylaxis, angioedema, dyspnea, rash, pruritus and urticaria have been reported with sodium sulfate, potassium sulfate, and magnesium sulfate oral solution [see Adverse Reactions (6.2)] . Inform patients of the signs and symptoms of anaphylaxis and instruct them to seek immediate medical care should signs and symptoms occur.

The following important adverse reactions for bowel preparations are described elsewhere in the labeling: Serious Fluid and Serum Chemistry Abnormalities [see Warnings and Precautions (5.1) ] Cardiac Arrhythmias [see Warnings and Precautions (5.2) ] Seizures [see Warnings and Precautions (5.3) ] Use in Patients with Risk of Renal Injury [see Warnings and Precautions (5.4) ] Colonic Mucosal Ulceration and Ischemic Colitis [see Warnings and Precautions (5.5) ] Patients with Significant Gastrointestinal Disease [see Warnings and Precautions (5.6) ] Aspiration [see Warnings and Precautions (5.7) ] Hypersensitivity Reactions [see Warnings and Precautions (5.8)] Most common adverse reactions are: Adults (>2%): overall discomfort, abdominal distention, abdominal pain, nausea, and vomiting. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Sun Pharmaceutical Industries, Inc., at 1-866-923-4914 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .

6.1 Clinical Trials Experience Because clinical studies are conducted under widely varying conditions, adverse reaction rates observed in the clinical studies of a drug cannot be directly compared to rates in clinical studies of another drug and may not reflect the rates observed in practice. Adults The safety of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution was evaluated in a multi-center, randomized, active controlled trial in 379 adult patients undergoing colonoscopy [see Clinical Studies (14) ] . Most Common Adverse Reactions Table 1 shows the most common adverse reactions reported in at least 2% of patients receiving sodium sulfate, potassium sulfate, and magnesium sulfate oral solution or the control (a bowel prep containing polyethylene glycol and electrolytes (PEG + E)) administered in split-dose (2-day) regimens. Table 1: Common Adverse Reactions reported in at least 2% of patients in Adult Patients Undergoing Colonoscopy in a Randomized, Active Controlled Trial Split-Dose (2-Day) Regimen Symptom Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution % N=190 PEG + E product % N=189 Overall Discomfort 54 67 Abdominal Distension 40 52 Abdominal Pain 36 43 Nausea 36 33 Vomiting 8 4 Laboratory Abnormalities Table 2 shows the most common laboratory abnormalities (at least 10% in either treatment group and more than 2% difference between groups) for patients who developed new abnormalities of important electrolytes and uric acid after completing the bowel preparation with either sodium sulfate, potassium sulfate, and magnesium sulfate oral solution or PEG+E administered as a split-dose (2-day) regimen. Table 2: Adult Patients with Normal Baseline Serum Chemistry with A Shift to an Abnormal Value While on the Split-Dose (2-Day) Regimen The study was not designed to support comparative claims for the laboratory abnormalities reported in this table. Day of Colonoscopy N (%) Percent (n/N) of patients where N=number of patients with normal baseline who had abnormal values at the time-point(s) of interest. Day 30 N (%) Bicarbonate (low) Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution 20 (13) 7(4) PEG + Electrolytes 24 (15) 4 (3) Bilirubin, total (high) Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution 14 (9) 0 (0) PEG + Electrolytes 20 (12) 3 (2) BUN (high) Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution 2 (2) 14 (11) PEG + Electrolytes 4(3) 19 (15) Calcium (high) Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution 16 (10) 8 (5) PEG + Electrolytes 6 (4) 6 (4) Chloride (high) Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution 4 (2) 6 (4) PEG + Electrolytes 20 (12) 6 (4) Osmolality (high) Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution 8 (6) NA PEG + Electrolytes 19 (13) NA Uric acid (high) Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution 27 (24) 13 (12) PEG + Electrolytes 12 (10) 20 (17) Less Common Adverse Reactions AV Block (1 case) and CK increase. Adverse Reactions with Unapproved Use In another study of 408 adult patients, higher rates of the following adverse reactions and laboratory abnormalities were reported in patients treated with sodium sulfate, potassium sulfate, and magnesium sulfate oral solution as an evening-only (1-day) regimen compared to the split-dose (2-day) regimen. overall discomfort, abdominal distention, nausea, and vomiting total bilirubin (high), BUN (high), creatinine (high), osmolality (high), potassium (high) and uric acid (high) Administration of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution in an evening-only (1-day) dosing regimen is not recommended. Pediatric use information is approved for Braintree Laboratories, Inc.'s SUPREP BOWEL PREP KIT (sodium sulfate, potassium sulfate, and magnesium sulfate) oral solution. However, due to Braintree Laboratories, Inc.'s marketing exclusivity rights, this drug product is not labeled with that pediatric information.

6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Hypersensitivity : anaphylaxis, angioedema, dyspnea, rash, pruritus, urticaria [see Warning and Precautions (5.8)].

Drugs that increase risk of fluid and electrolyte imbalance. ( 7.1 )

7.1 Drugs That May Increase Risk of Fluid and Electrolyte Abnormalities Use caution when prescribing sodium sulfate, potassium sulfate, and magnesium sulfate oral solution to patients taking medications that increase the risk of fluid and electrolyte disturbances or may increase the risk of adverse events of seizure, arrhythmias, and prolonged QT in the setting of fluid and electrolyte abnormalities [see Warnings and Precautions (5.1 , 5.2 , 5.3 , 5.4 ) ] .

7.2 Potential for Reduced Drug Absorption Sodium sulfate, potassium sulfate, and magnesium sulfate oral solution can reduce the absorption of other co-administered drugs [see Dosage and Administration (2.1) ] . Administer oral medications at least one hour before starting each dose of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution. Administer tetracycline and fluoroquinolone antibiotics, iron, digoxin, chlorpromazine, and penicillamine at least 2 hours before and not less than 6 hours after administration of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution to avoid chelation with magnesium.

7.3 Stimulant Laxatives Concurrent use of stimulant laxatives and sodium sulfate, potassium sulfate, and magnesium sulfate oral solution may increase the risk of mucosal ulceration or ischemic colitis. Avoid use of stimulant laxatives (e.g., bisacodyl, sodium picosulfate) while taking sodium sulfate, potassium sulfate, and magnesium sulfate oral solution [see Warnings and Precautions (5.5) ] .

8.1 Pregnancy Risk Summary There are no available data on sodium sulfate, potassium sulfate, and magnesium sulfate oral solution use in pregnant women to evaluate for a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes. Animal reproductive studies have not been conducted with sodium sulfate, potassium sulfate, and magnesium sulfate oral solution. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.

8.2 Lactation Risk Summary There are no data available data on the presence of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution in human or animal milk, the effects on the breastfed child, or the effects on milk production. The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for sodium sulfate, potassium sulfate, and magnesium sulfate oral solution and any potential adverse effects on the breastfed child from sodium sulfate, potassium sulfate, and magnesium sulfate oral solution or from the underlying maternal condition.

8.4 Pediatric Use The safety and effectiveness of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution in pediatric patients less than 12 years of age have not been established. Pediatric use information is approved for Braintree Laboratories, Inc.'s SUPREP BOWEL PREP KIT (sodium sulfate, potassium sulfate, and magnesium sulfate) oral solution. However, due to Braintree Laboratories, Inc.'s marketing exclusivity rights, this drug product is not labeled with that pediatric information.

8.5 Geriatric Use Of the 375 patients who received sodium sulfate, potassium sulfate, and magnesium sulfate oral solution in clinical trials, 94 (25%) were 65 years of age or older, and 25 (7%) were 75 years of age or older. No overall differences in safety or effectiveness of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution, administered as the recommended split-dose (2-day) regimen, were observed between geriatric patients and younger patients. Geriatric patients reported more vomiting when sodium sulfate, potassium sulfate, and magnesium sulfate oral solution was given as a one-day preparation (not a recommended regimen). Elderly patients are more likely to have decreased hepatic, renal or cardiac function and may be more susceptible to adverse reactions resulting from fluid and electrolyte abnormalities [see Warnings and Precautions (5.1) ].

8.6 Renal Impairment Use sodium sulfate, potassium sulfate, and magnesium sulfate oral solution with caution in patients with renal impairment or patients taking concomitant medications that may affect renal function. These patients may be at risk for renal injury. Advise these patients of the importance of adequate hydration before, during and after use of sodium sulfate, potassium sulfate, and magnesium sulfate oral solution and consider performing baseline and post-colonoscopy laboratory tests (electrolytes, creatinine, and BUN) in these patients [see Warnings and Precautions (5.4) ] .

Sulfate salts provide sulfate anions, which are poorly absorbed. The osmotic effect of unabsorbed sulfate anions and the associated cations causes water to be retained within the gastrointestinal tract.