SIDE EFFECTS: Nausea, vomiting, stomach/abdominal pain or bloating, dizziness, and headache may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur: black/bloody stools.

Seek immediate medical attention if any of these rare but serious side effects occur: fast/irregular heartbeat, chest pain, fainting, mental mood changes (such as confusion, unusual drowsiness), seizures.

Persistent diarrhea or vomiting may result in a serious loss of body water (dehydration) and minerals. Contact your doctor promptly if you notice any symptoms of dehydration, such as unusual decreased urination, unusual dry mouth/increased thirst, lack of tears, dizziness/lightheadedness, muscle weakness/cramping, or pale/wrinkled skin.

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

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

PRECAUTIONS: See also How to Use section.

Before taking sodium phosphate, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: heart problems (such as heart failure, irregular heartbeat, QT prolongation in the EKG, chest pain, heart attack or heart surgery within the last 3 months), stomach/abdominal problems (such as blockage, severe constipation), gastric bypass/stapling, irritable bowel disease/colitis, low blood minerals, severe loss of body water (dehydration), kidney problems, liver problems (such as cirrhosis, fluid build-up in the abdomen), salt restricted diet, daily alcohol or sedative use, seizure problem, swallowing problems (such as narrowing of the swallowing tube/ esophagus).

Before having surgery, tell your doctors or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

Caution is advised when using this drug in older adults because they may be more sensitive to the effects of the drug, especially kidney problems, dehydration, and irregular heartbeat.

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding.