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    Anticonvulsants for Cancer Pain

    Anticonvulsants for Cancer Pain


    Generic Name Brand Name
    carbamazepine Tegretol
    gabapentin Neurontin
    levetiracetam Keppra
    oxcarbazepine Trileptal
    phenytoin Dilantin
    pregabalin Lyrica
    topiramate Topamax
    zonisamide Zonegran

    How It Works

    Anticonvulsants control cancer pain by changing the way sodium and calcium travel across the surface of nerve cells in the brain. The nerve cells send fewer signals, and the brain senses less pain.

    Why It Is Used

    Anticonvulsants help reduce pain related to the nervous system (neuropathic pain). Some have fewer side effects than tricyclic antidepressants.

    How Well It Works

    Anticonvulsants help control cancer pain related to the nervous system (neuropathic pain).

    Side Effects

    When anticonvulsants are used to control cancer pain, they may be given in small amounts to limit side effects. Tell your doctor if you experience any side effects, especially:

    • Drowsiness.
    • Restlessness and irritability.
    • Confusion and dizziness.
    • Nausea, vomiting, loss of appetite, and belly pain.
    • Blurred vision or uncontrollable eye movements (nystagmus).
    • Itching, fever, or a rash (sensitivity reaction).

    The U.S. Food and Drug Administration (FDA) has issued a warning on anticonvulsants and the risk of suicide and suicidal thoughts. The FDA does not recommend that people stop using these medicines. Instead, people who take anticonvulsant medicine should be watched closely for warning signs of suicide. People who take anticonvulsant medicine and who are worried about this side effect should talk to a doctor.

    See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)

    What To Think About

    Women who use any of these medicines during pregnancy have a slightly higher chance of having a baby with birth defects. If you are pregnant or planning to get pregnant, you and your doctor must weigh the risks of using one of these medicines against the risks of not treating your condition.

    Drowsiness is the most common side effect of anticonvulsant drugs.

    These drugs are started at low doses and gradually increased to achieve pain relief.

    Complete the new medication information form (PDF) (What is a PDF document?) to help you understand this medication.


    ByHealthwise Staff
    Primary Medical Reviewer E. Gregory Thompson, MD - Internal Medicine
    Specialist Medical Reviewer Michael Seth Rabin, MD - Medical Oncology

    Current as ofSeptember 11, 2013

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