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Thirst, dry mouth, loss of appetite, constipation, or weakness 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.
Loss of too much body water (dehydration) can occur. The risk is increased if you have persistent vomiting or diarrhea, and cannot drink normally. Contact your doctor immediately if you notice any symptoms of dehydration, such as fast heartbeat or dizziness/lightheadedness.
People with severe liver disease (cirrhosis) may have increased risk of bleeding from the stomach or intestines while taking this medication. Tell your doctor immediately if you have any of the following symptoms: black/bloody stools, vomit that contains blood or looks like coffee grounds.
Tolvaptan may rarely cause serious (possibly fatal) liver disease. Get medical help right away if you have any symptoms of liver damage, including: dark urine, persistent nausea/vomiting/loss of appetite, stomach/abdominal pain, yellowing eyes/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 Samsca (tolvaptan tablets) Side Effects Center for a complete guide to possible side effects
PRECAUTIONS: Before taking tolvaptan, 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: diabetes, liver disease, inability to make urine (anuria), use/abuse of alcohol.
To prevent loss of too much body water (dehydration) while taking this medication, you must be able to replace fluids by drinking. Before taking this medication, tell your doctor if you are not able to drink normally or if you cannot feel if you are thirsty. (See also How to Use section.)
This medication may infrequently make your blood sugar level rise, which can cause or worsen diabetes. If you have diabetes, be sure to check your blood sugar regularly. Your doctor may need to adjust your diabetes medication, exercise program, or diet.
During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.
It is unknown if this medication passes into breast milk. Consult your doctor before breast-feeding.
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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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