riluzole


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amyotrophic lateral sclerosis

 
a progressive neurologic disease characterized by degeneration of cell bodies of the lower motor neurons in the gray matter of the anterior horns of the spinal cord, some brainstem motor neurons, and the pyramidal tracts. Called also Lou Gehrig's disease.

The disease presents in adulthood, usually between the ages of 40 and 70, and affects men two to three times more often than women. The initial symptom is weakness of skeletal muscles, especially in the limb. As the disease progresses the patient has difficulty swallowing and talking, with dyspnea as the accessory muscles of respiration are affected. Eventually muscles atrophy and the patient becomes a functional quadriplegic. Mentation is not affected, so that the patient remains alert and aware of functional loss and the inevitable outcome. Although there may be periods of remission, the disease usually progresses rapidly, with death in 2 to 5 years. The cause of ALS is not known and there is no cure. Treatment is intended to provide symptomatic relief, prevent complications, and maintain optimal function as long as possible.
Patient Care. For the most part, ALS patients are cared for at home and are hospitalized only for diagnosis, when severe dysphagia demands an esophagostomy or gastrostomy for feeding, or when medical treatment is necessary for acute respiratory problems.

Intervention is planned and implemented according to each patient's needs at specific times during the course of the illness. In general, the major problems encountered are those related to (1) dysphagia and the need to meet nutritional requirements and avoid aspiration, (2) dyspnea and maintenance of blood gases within normal range, (3) aphasia and impaired verbal communication, (4) weakness, impaired mobility, and activity intolerance, (5) constipation, (6) pain and discomfort due to muscle cramps, and (7) alteration in self-concept and body image.

The patient and family also will need assistance in managing home care, coping with the effects of the illness, and maintaining optimal functioning in the patient. Community health nurses and home health care professionals and paraprofessionals should be available to provide a variety of services including physical therapy, occupational therapy, social services, mental health care, and medical and nursing care.

A resource agency that can provide assistance and information to ALS patients and their families is the Amyotrophic Lateral Sclerosis Association, 21021 Ventura Blvd., Suite 321, Woodland Hills, CA 91364-2206, (800) 782–4747; http://www.alsa.org.

riluzole

Pharmacologic class: Glutamate antagonist

Therapeutic class: Amyotrophic lateral sclerosis (ALS) agent

Pregnancy risk category C

Action

Unknown. Thought to inhibit amino acid accumulation on motor neurons of CNS, improving nerve impulse transmission.

Availability

Tablets: 50 mg

Indications and dosages

ALS

Adults: 50 mg P.O. q 12 hours

Off-label uses

• Cervical dystonia
• Huntington's disease

Contraindications

• Hypersensitivity to drug or its components

Precautions

Use cautiously in:
• hepatic or renal insufficiency, neutropenia, febrile illness
• elderly patients
• female patients and Japanese patients (may have decreased metabolic capacity to eliminate drug)
• pregnant or breastfeeding patients
• children.

Administration

• Give at least 1 hour before or 2 hours after a meal to maximize absorption.

Adverse reactions

CNS: headache, dizziness, drowsiness, asthenia, hypertonia, depression, insomnia, malaise, vertigo, circumoral paresthesia

CV: hypertension, orthostatic hypotension, tachycardia, palpitations, peripheral edema, phlebitis, cardiac arrest

EENT: rhinitis, sinusitis, oral candidiasis

GI: nausea, vomiting, diarrhea, abdominal pain, dyspepsia, flatulence, stomatitis, dry mouth, anorexia

GU: urinary tract infection, dysuria

Hematologic: neutropenia

Musculoskeletal: back pain, joint pain

Respiratory: decreased lung function, increased cough, pneumonia

Skin: pruritus, eczema, alopecia, exfoliative dermatitis

Other: tooth disorders, weight loss

Interactions

Drug-drug.Allopurinol, methyldopa, sulfasalazine: increased risk of hepatotoxicity

CYP450-1A2 inducers (such as omeprazole, rifampin): increased riluzole elimination

CYP450-1A2 inhibitors (such as amitriptyline, phenacetin, quinolones, theophylline): decreased riluzole elimination

Drug-diagnostic tests.Alanine aminotransferase, aspartate aminotransferase, bilirubin, gamma-glutamyltransferase: increased levels

Drug-food.High-fat foods: decreased riluzole absorption

Drug-behaviors.Alcohol use: increased risk of hepatotoxicity

Patient monitoring

• Monitor liver function tests and CBC.
• Assess vital signs and cardiovascular status, particularly for hypertension, orthostatic hypotension, and peripheral edema.
• Closely monitor respiratory status for decreased lung function and pneumonia.
• Monitor weight, nutritional status, and hydration.
• Closely monitor females and patients of Japanese origin, who are at increased risk for adverse reactions.

Patient teaching

• Tell patient to take 1 hour before or 2 hours after a meal, at same time each day.
• Instruct patient to take his temperature regularly and report fever.

Teach patient to immediately report arm or leg swelling, difficulty breathing, and other signs of decreased lung function.
• Advise patient to minimize GI upset by eating small, frequent servings of food and drinking plenty of fluids.
• Caution patient to avoid high-fat foods and alcohol.
• Instruct patient to move slowly when sitting up or standing, to avoid dizziness from sudden blood pressure decrease.
• As appropriate, review all other significant and life-threatening adverse reactions and interactions, especially those related to the drugs, tests, foods, and behaviors mentioned above.

riluzole

/ril·u·zole/ (ril´u-zōl) a compound used to prolong survival time in the treatment of amyotrophic lateral sclerosis.

riluzole

a glutamate antagonist.
indication This drug is used to treat amyotropic lateral sclerosis.
contraindication Known hypersensitivity to this drug prohibits its use.
adverse effects Neutropenia and exfoliative dermatitis are life-threatening effects. Other adverse effects are nausea, vomiting, dyspepsia, anorexia, diarrhea, flatulence, stomatitis, dry mouth, hypertonia, depression, dizziness, insomnia, somnolence, vertigo, pruritus, eczema, alopecia, decreased lung function, rhinitis, increased cough, hypertension, tachycardia, phlebitis, palpitations, postural hypertension, urinary tract infection, and dysuria.

riluzole

Rilutek® Neurology A drug with some benefit to Parkinson's disease and amyotrophic lateral sclerosis. See Amyotrophic lateral sclerosis, Parkinsonism.

riluzole

An antiglutamate drug used to slow the rate of progress and prolong life in AMYOTROPHIC LATERAL SCLEROSIS. A brand name is Rilutek.

Riluzole (Rilutek)

The first drug approved in the United States for the treatment of ALS.

riluzole (ril´əzōl´),

n brand name: Rilutek;
drug class: glutamate antagonist;
action: inhibits presynaptic release of glutamic acid in central nervous system;
use: treatment of amyotrophic lateral sclerosis (Lou Gehrig disease).
References in periodicals archive ?
Because riluzole is probably most effective when given early in the course of the disease, early diagnosis is of paramount importance (Househam & Swash, 2000; Swash, 1998).
Although riluzole extends life, it cannot halt the degenerative nerve disease, repair the nervous system, or even make patients feel better.
In 1995, riluzole (Rilutek[R]) was approved by the Food and Drug Administration (FDA) for management of ALS.
An experimental drug, riluzole, showed the progression of amyotrophic lateral sclerosis, the neuromuscular disease also known as Lou Gehrig's disease.
They'll go anywhere to get it," he says, adding that he remains deeply skeptical about the drug, riluzole.
This has contributed to the fact that today just one treatment for ALS exists, Riluzole, which extends survival by approximately three months.
They include riluzole, a drug used to treat ALS ("Lou Gehrig's disease"), and the cannabis derivative dronabinol.
Riluzole, for example, inhibits glutamate release from nerve cells.
These generic Riluzole Hydrochloride tablets contain Riluzole Hydrochloride 50 mg.
NACTN recently concluded a Phase 1 safety study of the drug Riluzole.
The drugs, Aricept, Exelon and Reminyl, for Alzheimer's and Riluzole for motor neuron disease, slow the onset of Alzheimer's and extend the life of MND sufferers by a precious few months.
All patients enrolled in the trial were allowed to use riluzole (83 percent of patients were on riluzole at the beginning of trial) in combination with Talampanel.