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Side Effects


Clinical Studies Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.

Abdominal bloating, nausea, abdominal pain, and vomiting were the most common adverse events reported with the use of OsmoPrep Tablets. Dizziness and headache were reported less frequently. Since diarrhea was considered as a part of the efficacy of OsmoPrep, diarrhea was not defined as an adverse event in the clinical studies. Table 1 shows the most common adverse events associated with the use of 48 grams of OsmoPrep, 60 grams of OsmoPrep, and 60 grams of Visicol in the colon preparation trials (n= 931).

Table 1: Frequency of Adverse Events of Any Severity Occurring in Greater Than 3% of Patients in the OsmoPrep Trials

  OsmoPrep 32 tabs (48 g)
OsmoPrep 40 tabs (60 g)
Visicol 40 tabs (60 g)
Bloating 31% 39% 41%
Nausea 26% 37% 30%
Abdominal Pain 23% 24% 25%
Vomiting 4% 10% 9%

Postmarketing Experience

In addition to adverse events reported from clinical trials, the following adverse events have been identified during post-approval use of OsmoPrep. Because they are reported voluntarily from a population of unknown size, estimates of frequency cannot be made. These events have been chosen for inclusion due to either their seriousness, frequency of reporting or causal connection to OsmoPrep, or a combination of these factors.

Body as a Whole: Hypersensitivity reactions including anaphylaxis, rash, pruritus, urticaria, throat tightness, bronchospasm, dyspnea, pharyngeal edema, dysphagia, paresthesia and swelling of the lips and tongue, and facial swelling.

Cardiovascular: Arrhythmias

Nervous system: Seizures

Renal: Renal impairment, increased blood urea nitrogen (BUN), increased creatinine, acute renal failure, acute phosphate nephropathy, nephrocalcinosis, and renal tubular necrosis.

Read the OsmoPrep (sodium phosphate monobasic monohydrate and sodium phosphate dibasic anhydrous) Side Effects Center for a complete guide to possible side effects


Drugs That May Increase Risks Due to Fluid and Electrolyte Abnormalities

Use caution when prescribing OsmoPrep for 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 prolonged QT in the setting of fluid and electrolyte abnormalities. Consider additional patient evaluations as appropriate [see WARNINGS] in patients taking these concomitant medications.

Potential for Altered Drug Absorption

Oral medication administered within one hour of the start of each OsmoPrep dose may be flushed from the gastrointestinal tract, and the medication may not be absorbed properly.

Drug Abuse And Dependence

Laxatives and purgatives (including OsmoPrep) have the potential for abuse by patients who frequently engage in binge eating and vomiting to lose weight.

Read the OsmoPrep Drug Interactions Center for a complete guide to possible interactions

This monograph has been modified to include the generic and brand name in many instances.

Last reviewed on RxList: 10/25/2012

Side Effects

OsmoPrep - User Reviews

OsmoPrep User Reviews

Now you can gain knowledge and insight about a drug treatment with Patient Discussions.

Here is a collection of user reviews for the medication OsmoPrep sorted by most helpful. Patient Discussions FAQs

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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