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Some commonly used brand names are:
In the U.S.—
Generic name product may be available in the U.S. and Canada.
Quinidine (KWIN-i-deen) is used to treat abnormal heart rhythms. It is also used to treat malaria.
Do not confuse this medicine with quinine , which, although related, has different medical uses.
Quinidine is available only with your doctor"s prescription, in the following dosage forms:
Before Using This Medicine
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 quinidine, the following should be considered:
Allergies—Tell your doctor if you have ever had any unusual or allergic reaction to quinidine or quinine. Also tell your health care professional if you are allergic to any other substances, such as foods, preservatives, or dyes.
Pregnancy—Studies on effects in pregnancy have not been done in either humans or animals. However, quinidine has been used during pregnancy and, although serious side effects are uncommon, it has been shown to cause mild uterine contractions, premature labor, and blood problems in the neonate.
Breast-feeding—Quinidine passes into breast milk and, because of the potential for problems in the nursing infant, it is generally not recommended in mothers who are breast-feeding.
Children—Quinidine has not been widely studied in children; however, it is used in children to treat abnormal heart rhythms and to treat malaria. Children may be able to take higher doses than adults and may have fewer side effects (such as vomiting, loss of appetite, and diarrhea) than adults.
Older adults—Many medicines have not been studied specifically in older people. Therefore, it may not be known whether they work exactly the same way they do in younger adults. Although there is no specific information comparing use of quinidine in the elderly with use in other age groups, this medicine is not expected to cause different side effects or problems in older people than it does in younger adults. However, quinidine may remain in the bodies of older adults longer than it does in younger adults, which may increase the risk of side effects and which may require lower doses.
Other 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 quinidine, it is especially important that your health care professional know if you are taking any of the following:
Other medical problems—The presence of other medical problems may affect the use of quinidine. Make sure you tell your doctor if you have any other medical problems, especially:
Proper Use of This Medicine
Take this medicine exactly as directed . Do not take more of this medicine and do not take it more often than your doctor ordered. Do not miss any doses.
Taking quinidine with food may help lessen stomach upset.
For patients taking the extended-release tablet form of this medicine:
Dosing—The dose of quinidine 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 quinidine. If your dose is different, do not change it unless your doctor tells you to do so.
The number of tablets 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 taking quinidine .
Missed dose—If you miss a dose of this medicine and remember within 2 hours of the missed dose, take it as soon as possible. However, if you do not remember until later, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Storage—To store this medicine:
Precautions While Using This Medicine
It is very important that your doctor check your progress at regular visits to make sure that the quinidine is working properly and does not cause unwanted effects.
Do not stop taking this medicine without first checking with your doctor, to avoid possible worsening of your condition.
Before having any kind of surgery (including dental surgery) or emergency treatment, tell the medical doctor or dentist in charge that you are taking this medicine.
Dizziness or lightheadedness may occur with this medicine, especially when you get up from a lying or sitting position. Getting up slowly may help.
Fainting may occur with this medicine . Do not drive or do anything else that could be dangerous if fainting occurs .
. Check with your doctor immediately if you faint or experience other side effects with this medicine .
Your doctor may want you to carry a medical identification card or bracelet stating that you are using this medicine.
Side Effects of This Medicine
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:
Abdominal pain and/or yellow eyes or skin; blurred and/or double vision, confusion, delirium, disturbed color perception, headache, noises or ringing in the ear, and/or visual intolerance of light; dizziness or lightheadedness; fainting; fever
Chest pain, fever, general discomfort, joint pain, joint swelling, muscle pain, and/or skin rash; nosebleeds or bleeding gums; unusual tiredness or weakness and/or pale skin
Other 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. However, check with your doctor if any of the following side effects continue or are bothersome:
Diarrhea; loss of appetite; muscle weakness; nausea or vomiting
Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.
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