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 doctor.
- 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.
The nasal flu vaccine (e.g., live attenuated influenza vaccine, Flumist®) should not be given in the 2 weeks before or 48 hours after taking this medicine.
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:
- Adults and teenagers—200 milligrams (mg) or four teaspoonfuls once a day as a single dose.
- Older adults—100 milligrams (mg) once a day as a single dose.
- Children 9 to 12 years of age—100 milligrams (mg) or two teaspoonfuls two times a day.
- Children 1 to 9 years of age—Dose is based on body weight and must be determined by the doctor. The usual dose is 4.4 to 8.8 milligrams (mg) per kilogram (kg) of body weight per day. The dose is divided evenly and given two times a day. However, the dose is usually not more than 150 mg per day.
- 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:
- Adults—100 milligrams (mg) two times a day. Your doctor may adjust your dose if needed.
- Older adults—At first, 100 milligrams (mg) once a day as a single dose. Your doctor may adjust your dose if needed.
- Children—Use and dose must be determined by your doctor.
- For the treatment or prevention of flu:
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.
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.