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(tolvaptan) Tablets for Oral Use
INITIATE AND RE-INITIATE IN A HOSPITAL AND MONITOR SERUM SODIUM
SAMSCA should be initiated and re-initiated in patients only in a hospital where serum sodium can be monitored closely.
Too rapid correction of hyponatremia (e.g., > 12 mEq/L/24 hours) can cause osmotic demyelination resulting in dysarthria, mutism, dysphagia, lethargy, affective changes, spastic quadriparesis, seizures, coma and death. In susceptible patients, including those with severe malnutrition, alcoholism or advanced liver disease, slower rates of correction may be advisable.
Tolvaptan is (±)-4'-[(7-chloro-2,3,4,5-tetrahydro-5-hydroxy-1H-1-benzazepin-1-yl) carbonyl]-otolu-m-toluidide. The empirical formula is C26H25ClN2O3. Molecular weight is 448.94. The chemical structure is:
SAMSCA tablets for oral use contain 15 mg or 30 mg of tolvaptan. Inactive ingredients include corn starch, hydroxypropyl cellulose, lactose monohydrate, low-substituted hydroxypropyl cellulose, magnesium stearate and microcrystalline cellulose and FD&C Blue No. 2 Aluminum Lake as colorant.
What are the possible side effects of tolvaptan (Samsca)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Tell your caregivers at once if you have any of these signs that your hyponatremia is being reversed too quickly:
- problems with speech or muscle control;
- trouble swallowing;
- trouble moving your arms and legs;
- mood changes; and
- seizure (convulsions).
Stop using tolvaptan and call your doctor at once if you have:
- weakness or fainting;
What are the precautions when taking tolvaptan tablets (Samsca)?
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...
Last reviewed on RxList: 3/17/2014
This monograph has been modified to include the generic and brand name in many instances.
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