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Drugs reference index «rimantadine»

rimantadine (Oral route)


Commonly used brand name(s):

In the U.S.

  • Flumadine

Available Dosage Forms:

  • Tablet
  • Syrup

Therapeutic Class: Antiviral

Chemical Class: Adamantane

Uses For rimantadine

Rimantadine 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. Rimantadine will not work for colds, other types of flu, or other virus infections.

Rimantadine is available only with your doctor's prescription.

Before Using rimantadine

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 rimantadine, the following should be considered:


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


rimantadine has been tested in children over one 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 rimantadine in children under one year of age with use in other age groups.


Elderly people are especially sensitive to the effects of rimantadine. Difficulty in sleeping, difficulty in concentrating, dizziness, headache, nervousness, and weakness may be especially likely to occur. Stomach pain, nausea, vomiting, and loss of appetite may also occur.


Pregnancy CategoryExplanation
All TrimestersCAnimal 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.

Breast Feeding

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. Tell your healthcare professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.

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. 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 rimantadine. Make sure you tell your doctor if you have any other medical problems, especially:

  • Epilepsy or other seizures (history of)—Rimantadine may increase the frequency of convulsions (seizures) in patients with a seizure disorder
  • Kidney disease—Rimantadine is removed from the body by the kidneys; patients with severe kidney disease will need to receive a lower dose of rimantadine
  • Liver disease—Patients with severe liver disease may need to receive a lower dose of rimantadine

Proper Use of rimantadine

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

rimantadine 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 rimantadine for the full time of treatment.

If you already have the flu, continue taking rimantadine 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 rimantadine too soon, your symptoms may return. rimantadine should be taken for at least 5 to 7 days.

rimantadine 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.

If you are using the oral liquid form of rimantadine, 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.


The dose of rimantadine 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 rimantadine. 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 (syrup, tablets):
    • For the prevention or treatment of flu:
      • Elderly adults—100 milligrams (mg) once a day.
      • Adults and children 10 years of age and older—100 mg two times a day.
      • Children up to 10 years of age—5 mg per kilogram (2.3 mg per pound) of body weight once a day. Children in this age group should not receive more than 150 mg a day.

Missed Dose

If you miss a dose of rimantadine, 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.


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.

Precautions While Using rimantadine

rimantadine may cause some people to become dizzy or confused, or to have trouble concentrating. Make sure you know how you react to rimantadine before you drive, use machines, or do anything else that could be dangerous if you are dizzy or confused. If these reactions are especially bothersome, check with your doctor.

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

rimantadine 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.

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:

Less common
  • Difficulty in concentrating
  • dizziness
  • dryness of mouth
  • headache
  • loss of appetite
  • nausea
  • nervousness
  • stomach pain
  • trouble in sleeping
  • unusual tiredness
  • vomiting

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.

The information contained in the Thomson Healthcare (Micromedex) products as delivered by Drugs.com is intended as an educational aid only. It is not intended as medical advice for individual conditions or treatment. It is not a substitute for a medical exam, nor does it replace the need for services provided by medical professionals. Talk to your doctor, nurse or pharmacist before taking any prescription or over the counter drugs (including any herbal medicines or supplements) or following any treatment or regimen. Only your doctor, nurse, or pharmacist can provide you with advice on what is safe and effective for you.

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  • rimantadine Concise Consumer Information (Cerner Multum)
  • Rimantadine MedFacts Consumer Leaflet (Wolters Kluwer)
  • Rimantadine Prescribing Information (FDA)
  • Flumadine Prescribing Information (FDA)

See Also...

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