Medically reviewed on Oct 31, 2018
Commonly used brand name(s)
In the U.S.
Available Dosage Forms:
Therapeutic Class: Central Nervous System Agent
Pharmacologic Class: Glutamate Antagonist
Uses For riluzole
Riluzole is used to treat patients with amyotrophic lateral sclerosis (ALS), which is also known as Lou Gehrig's disease. Riluzole is not a cure for ALS, but it may extend survival for patients in the early stages of the disease or extend the time until a tracheostomy (breathing tube in the throat) is needed.
Riluzole is available only with your doctor's prescription.
Before Using riluzole
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For riluzole, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to riluzole or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies have not been performed on the relationship of age to the effects of riluzole in the pediatric population. Safety and efficacy have not been established.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of riluzole in the elderly. However, elderly patients are more likely to have age-related liver problems, which may require caution and an adjustment in the dose for patients receiving riluzole.
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with Medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are taking riluzole, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using riluzole with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Interactions with Food/Tobacco/Alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using riluzole with any of the following is usually not recommended, but may be unavoidable in some cases. If used together, your doctor may change the dose or how often you use riluzole, or give you special instructions about the use of food, alcohol, or tobacco.
Other Medical Problems
The presence of other medical problems may affect the use of riluzole. Make sure you tell your doctor if you have any other medical problems, especially:
- Bone marrow problems (eg, neutropenia) or
- Liver disease, recent or history of or
- Lung disease (eg, interstitial lung disease)—Use with caution. May make these conditions worse.
- Liver disease—Use with caution. The effects may be increased because of slower removal of the medicine from the body.
Proper Use of riluzole
Take riluzole only as directed by your doctor. Do not take more of it, do not take it more often, and do not take it for a longer time than your doctor ordered.
Riluzole comes with patient instructions. Read and follow these instructions carefully. Ask your doctor if you have any questions.
Swallow the tablet whole. Do not break, crush, or chew it.
Measure the oral liquid with the oral syringe that it comes with. Gently shake the oral liquid for at least 30 seconds before using it.
Riluzole should be taken on an empty stomach. Take it at least 1 hour before or 2 hours after meals.
Riluzole works best if there is a constant amount in the blood. To keep blood levels constant, take riluzole at the same time each day (eg, in the morning and in the evening) and do not miss any doses.
The dose of riluzole will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of riluzole. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
- For oral dosage form (suspension, tablets):
- For ALS:
- Adults—50 milligrams (mg) (10 milliliters [mL]) 2 times a day (every 12 hours).
- Children—Use and dose must be determined by your doctor.
- For ALS:
If you miss a dose of riluzole, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Tablet: Skip the missed dose and take your next dose at the regular time. Do not use extra medicine to make up for a missed dose.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Ask your healthcare professional how you should dispose of any medicine you do not use.
Throw away any unused liquid after 15 days of opening the bottle.
Precautions While Using riluzole
It is very important that your doctor check your progress at regular visits to make sure that riluzole is working properly. Blood tests may be needed to check for unwanted effects.
Check with your doctor right away if you have a rash, stomach pain, pale stools, dark urine, loss of appetite, nausea, unusual tiredness or weakness, or yellow eyes or skin. These could be symptoms of a serious liver problem.
Riluzole can temporarily lower the number of white blood cells in your blood, increasing the chance of getting an infection. If you can, avoid people with infections. Check with your doctor right away if you think you are getting an infection or if you have a fever or chills, cough or hoarseness, lower back or side pain, or painful or difficult urination.
Check with your doctor right away if you start having breathing problems, dry cough, chest pain, fever, or chills. These could be symptoms of a serious lung problem.
Tell your doctor if you have Japanese ancestry. You may need a lower dose of riluzole to avoid unwanted effects.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.
Riluzole Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
- Bladder pain
- bloody or cloudy urine
- blurred vision
- dark urine
- difficult, burning, or painful urination
- fast, pounding, or irregular heartbeat or pulse
- frequent urge to urinate
- general feeling of discomfort or illness
- increased cough
- itching skin
- joint pain
- loss of appetite
- lower back or side pain
- muscle aches and pains
- persistent loss of appetite or weight loss
- pounding in the ears
- right upper quadrant tenderness
- runny nose
- slow heartbeat
- sore throat
- trouble sleeping
- unusual tiredness or weakness
- yellow eyes or skin
Incidence not known
- Black, tarry, stools
- decreased frequency or amount of urine
- difficult breathing
- increased thirst
- pale skin
- swelling of the face, fingers, or lower legs
- ulcers, sores, or white spots in the mouth
- unusual bleeding or bruising
- weight gain
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
- Lack or loss of strength
- Difficulty moving
- dizziness or lightheadedness
- dry mouth
- excess air or gas in the stomach or bowels
- feeling of constant movement of self or surroundings
- full feeling
- muscle stiffness
- passing gas
- rapid weight gain
- sensation of spinning
- skin rash, encrusted, scaly and oozing
- sleepiness or unusual drowsiness
- stomach pain
- tingling of the hands or feet
- unusual weight gain or loss
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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