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Cancer Health Center

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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 ReviewerE. Gregory Thompson, MD - Internal Medicine
Specialist Medical ReviewerMichael Seth Rabin, MD - Medical Oncology

Current as ofNovember 14, 2014

WebMD Medical Reference from Healthwise

Last Updated: November 14, 2014
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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