Posted by: Thixia | April 13, 2008

Amantadine for MS-Related Fatigue

Amantadine (Oral Route)

 

Brand Names

 

Symmetrel

 

Description

 

Amantadine is an antiviral. It is used to prevent or treat certain influenza (flu) infections (type A). It may be given alone or along with flu shots. Amantadine will not work for colds, other types of flu, or other virus infections.

 

Amantadine also is an antidyskinetic. It is used to treat Parkinson’s disease, sometimes called paralysis agitans or shaking palsy. It may be given alone or with other medicines for Parkinson’s disease. By improving muscle control and reducing stiffness, this medicine allows more normal movements of the body as the disease symptoms are reduced. Amantadine is also used to treat stiffness and shaking caused by certain medicines used to treat nervous, mental, and emotional conditions.  Amantadine may be used for other conditions such as MS-Related Fatigue as determined by your doctor.

 

Amantadine is available only with your doctor’s prescription.

Once a medicine has been approved for marketing for a certain use, experience may show that it is also useful for other medical problems. Although this use is not included in product labelling, amantadine is used in certain patients with the following medical condition:

 

·    Unusual tiredness or weakness associated with multiple sclerosis

 

This product is available in the following dosage forms:

 

·    Capsule, Liquid Filled

·    Syrup

·    Tablet

 

Before Using

 

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 this medicine, the following should be considered:

 

Allergies

 

Tell your doctor if you have ever had any unusual or allergic reaction to this medicine 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.

 

Pediatric

 

This medicine has been tested in children over 1 year of age and has not been shown to cause different side effects or problems in these children than it does in adults. There is no specific information comparing the use of amantadine in children under 1 year of age with use in other age groups.

 

Geriatric

 

Elderly people are especially sensitive to the effects of amantadine. Confusion, difficult urination, blurred vision, constipation, and dry mouth, nose, and throat may be especially likely to occur.

 

Pregnancy

 

 

Pregnancy Category

Explanation

All Trimesters

C

Animal studies have shown an adverse effect and there are no adequate studies in pregnant women OR no animal studies have been conducted and there are no adequate studies in pregnant women.

 

Breastfeeding

 

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.

 

Drug Interactions

 

Using this medicine with any of the following medicines is not recommended. Your doctor may decide not to treat you with this medication or change some of the other medicines you take.

 

·    Potassium Chloride

 

Other Interactions

 

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. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.

 

Other Medical Problems

 

The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:

 

·    Eczema (recurring)—Amantadine may cause or worsen eczema

·    Epilepsy or other seizure disorder (history of)—Amantadine may increase the frequency of convulsions (seizures) in patients with a seizure disorder

·    Heart disease or other circulation problems or

·    Swelling of feet and ankles—Amantadine may increase the chance of swelling of the feet and ankles, and may worsen heart disease or circulation problems

·    Kidney disease—Amantadine is removed from the body by the kidneys; patients with kidney disease will need to receive a lower dose of amantadine

·    Mental or emotional illness—Higher doses of amantadine may cause confusion, hallucinations, and nightmares

·    Substance abuse (drug or alcohol abuse), history of—The chance of side effects from this medicine may be increased

 

Proper Use

 

For patients taking amantadine to prevent or treat flu infections :

Talk to your doctor about the possibility of getting a flu shot if you have not had one yet.

 

This medicine is best taken before exposure, or as soon as possible after exposure, to people who have the flu.

 

To help keep yourself from getting the flu, keep taking this medicine for the full time of treatment. Or if you already have the flu, continue taking this medicine for the full time of treatment even if you begin to feel better after a few days. This will help to clear up your infection completely. If you stop taking this medicine too soon, your symptoms may return. This medicine should be taken for at least 2 days after all your flu symptoms have disappeared.

 

This medicine works best when there is a constant amount in the blood. To help keep the amount constant, do not miss any doses. Also, it is best to take the doses at evenly spaced times day and night. For example, if you are to take two doses a day, the doses should be spaced about 12 hours apart. If this interferes with your sleep or other daily activities, or if you need help in planning the best times to take your medicine, check with your health care professional.

 

If you are using the oral liquid form of amantadine, use a specially marked measuring spoon or other device to measure each dose accurately. The average household teaspoon may not hold the right amount of liquid.

 

For patients taking amantadine for Parkinson’s disease or movement problems caused by certain medicines used to treat nervous, mental, and emotional conditions:

 

Take this medicine exactly as directed by your doctor. Do not miss any doses and do not take more medicine than your doctor ordered.

 

Improvement in the symptoms of Parkinson’s disease usually occurs in about 2 days. However, in some patients this medicine must be taken for up to 2 weeks before full benefit is seen.

 

Dosing

 

The dose of this medicine 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 this medicine. 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 forms (capsules, syrup, and tablets):

For the treatment or prevention of flu:

 

·    Older adults—100 milligrams once a day.

·    Adults and children 12 years of age and older—200 milligrams once a day, or 100 milligrams two times a day.

·    Children 9 to 12 years of age—100 milligrams two times a day.

·    Children 1 to 9 years of age—Dose is based on body weight and must be determined by the doctor.

·    Children up to 1 year of age—Use and dose must be determined by your doctor

 

For the treatment of Parkinson’s disease or movement problems:

Older adults—100 milligrams once a day to start. The dose may be increased slowly over time, if needed.

 

·    Adults—100 milligrams one or two times a day. Your doctor may increase this dose, if needed.

·    Children—Dose has not been determined.

·     

Missed Dose

 

If you miss a dose of this medicine, 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.

 

Storage

 

·    Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.

·    Keep the bottle closed when you are not using it. Keep it in the refrigerator. Do not freeze.

·    Keep out of the reach of children.

·    Do not keep outdated medicine or medicine no longer needed.

 

Precautions

 

Drinking alcoholic beverages while taking this medicine may cause increased side effects such as circulation problems, dizziness, lightheadedness, fainting, or confusion. Therefore, do not drink alcoholic beverages while you are taking this medicine.

 

This medicine may cause some people to become dizzy, confused, or light-headed, or to have blurred vision or trouble concentrating. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are dizzy or are not alert or able to see well. If these reactions are especially bothersome, check with your doctor.

 

Getting up suddenly from a lying or sitting position also may be a problem because of the dizziness, lightheadedness, or fainting that may be caused by this medicine. Getting up slowly may help. If this problem continues or gets worse, check with your doctor.

 

If amantadine causes you to feel very depressed or to have thoughts of suicide, check with your doctor immediately.

 

Amantadine may cause dryness of the mouth, nose, and throat. For temporary relief of mouth dryness, use sugarless candy or gum, melt bits of ice in your mouth, or use a saliva substitute. However, if your mouth continues to feel dry for more than 2 weeks, check with your doctor or dentist. Continuing dryness of the mouth may increase the chance of dental disease, including tooth decay, gum disease, and fungus infections.

 

This medicine may cause purplish red, net-like, blotchy spots on the skin. This problem occurs more often in females and usually occurs on the legs and/or feet after this medicine has been taken regularly for a month or more. Although the blotchy spots may remain as long as you are taking this medicine, they usually go away gradually within 2 to 12 weeks after you stop taking the medicine. If you have any questions about this, check with your doctor.

 

For patients taking amantadine to prevent or treat flu infections:

 

If your symptoms do not improve within a few days, if they become worse, or you develop new symptoms, check with your doctor.

For patients taking amantadine for Parkinson’s disease or movement problems caused by certain medicines used to treat nervous, mental, and emotional conditions:

 

Patients with Parkinson’s disease must be careful not to overdo physical activities as their condition improves and body movements become easier since injuries resulting from falls may occur. Such activities must be gradually increased to give your body time to adjust to changing balance, circulation, and coordination.

 

Some patients may notice that this medicine gradually loses its effect while they are taking it regularly for a few months. If you notice this, check with your doctor. Your doctor may want to adjust the dose or stop the medicine for a while and then restart it to restore its effect.

Do not suddenly stop taking this medicine without first checking with your doctor since your Parkinson’s disease may get worse very quickly. Your doctor may want you to reduce your dose gradually before stopping the medicine completely.

 

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:

 

Less common

 

·    Blurred vision

·    Confusion (especially in elderly patients)

·    Difficult urination (especially in elderly patients)

·    Fainting

·    Hallucinations (seeing, hearing, or feeling things that are not there)

·    Swelling of hands, feet, or lower legs

·    Rare

·    Convulsions (seizures)

·    Decreased vision or any change in vision

·    Difficulty in coordination

·    Fever, chills, or sore throat

·    Increased blood pressure

·    Increase in body movements

·    Irritation and swelling of the eye

·    Loss of memory

·    Mental depression

·    Severe mood or mental changes

·    Skin rash

·    Slurred speech

·    Thoughts of suicide or attempts at suicide

·    Unexplained shortness of breath

 

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:

 

More common

 

·    Agitation, anxiety, or nervousness

·    Difficulty concentrating

·    Dizziness or lightheadedness

·    Headache

·    Irritability

·    Loss of appetite

·    Nausea

·    Purplish red, net-like, blotchy spots on skin

·    Trouble in sleeping or nightmares

·    Less common or rare

·    Constipation

·    Decrease in sexual desire

·    Diarrhea

·    Drowsiness

·    Dryness of the mouth, nose, and throat

·    False sense of well-being

·    Headache

·    Vomiting

·    Unusual tiredness or weakness

 

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

 

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