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    Neuropathy secondary to drugs

    Neuropathy secondary to drugs is a loss of sensation or movement in a part of the body due to nerve damage from a certain medicine.

    Causes

    The damage is caused by the toxic effects of certain medications on the peripheral nerves (nerves that are not in the brain or spinal cord). There may be damage to the axon part of the nerve cell, which interferes with nerve signals.

    Most commonly, many nerves are involved (polyneuropathy). This usually causes sensation changes that begin in the outside parts of the body (distal) and move toward the center of the body (proximal). There may also be changes in movement, such as weakness.

    Many medications may affect the development of neuropathy, including:

    • Heart or blood pressure medications
      • Amiodarone
      • Hydralazine
      • Perhexiline
    • Drugs used to fight cancer
      • Cisplatin
      • Docetaxel
      • Paclitaxel
      • Suramin
      • Vincristine
    • Drugs used to fight infections
      • Chloroquine
      • Isoniazid (INH) -- used against tuberculosis
      • Metronidazole (Flagyl)
      • Nitrofurantoin
      • Thalidomide (used to fight leprosy)
    • Drugs used to treat autoimmune disease
      • Etanercept
      • Infliximab
      • Leflunomide
    • Drugs used to treat skin conditions (Dapsone)
    • Anticonvulsants (phenytoin)
    • Anti-alcohol drugs (disulfiram)
    • Drugs to fight HIV
      • Didanosine (Videx)
      • Stavudine (Zerit)
      • Zalcitabine (Hivid)
    • Arsenic
    • Colchicine
    • Gold

    Symptoms

    • Numbness, loss of sensation
    • Tingling, abnormal sensations
    • Weakness

    Sensation changes usually begin in the feet or hands and move inward.

    Exams and Tests

    A brain and nervous system examination will be done.

    Other tests include:

    • Blood tests to check levels of the medication (even normal blood levels of certain drugs may be toxic in elderly or certain other persons)
    • EMG and nerve conduction test of the electrical activity of nerves and muscles

    Treatment

    Treatment is based on the symptoms and how severe they are. The medication causing the neuropathy may be stopped, reduced in dose, or changed to another medication. (Never change any medication without first talking to your health care provider).

    The following medications may be used to control pain:

    • Over-the-counter pain relievers may be helpful for mild pain (neuralgia).
    • Phenytoin, carbamazepine, gabapentin, pregabalin, duloxetine, or tricyclic antidepressants such as nortriptyline may reduce the stabbing pains some people experience.
    • Opiate pain relievers, such as morphine or fentanyl, may be needed to control severe pain.

    Whenever possible, avoid or reduce medication use to lessen the risk of side effects.

    If you have lost sensation, you may need to take safety measures to avoid injury.

    Outlook (Prognosis)

    Many people can partially or fully return to their normal function. The disorder does not usually cause life-threatening complications, but it can be uncomfortable or disabling.

    Possible Complications

    • Inability to function at work or home because of permanent loss of sensation
    • Pain with tingling in the area of the nerve injury
    • Permanent loss of sensation (or rarely, movement) in an area

    When to Contact a Medical Professional

    Call your health care provider if you have a loss of sensation or movement of any area of the body while taking any medication.

    Prevention

    Your health care provider will closely monitor your treatment with any medication that may cause neuropathy. The goal is to keep the proper blood level of medication needed to control the disease and its symptoms while preventing the medication from reaching toxic levels.

    References

    Katirji B, Koontz D. Disorders of peripheral nerves. In: Daroff RB, Fenichel GM, Jankovic J, Mazziotta JC. Bradley’s Neurology in Clinical Practice. 6th ed. Philadelphia, PA: Elsevier Saunders; 2012:chap 76.

    Weimer LH, Sachdev N. Update on medication-induced peripheral neuropathy. Curr Neurol Neurosci Rep. 2009;9(1):69-75.

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          Tests for Neuropathy secondary to drugs

            Review Date: 2/27/2013

            Reviewed By: Luc Jasmin, MD, PhD, Department of Neurosurgery, Cedars Sinai Medical Center, Los Angeles and Department of Anatomy, University of California, San Francisco, CA. Review provided by VeriMed Healthcare Network. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.

            The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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