Quinidine - oral

Patient Medicine Information
Why do I need this medicine?
Quinidine is used to treat abnormal heart rhythm. This medicine may also be used to treat malaria.
How do I take this medicine?
Take Quinidine exactly as directed by your doctor or according to the instructions on the label. Do not take more or less than instructed by your doctor.

This medicine should be taken with food or milk to decrease stomach discomfort. Try to take it at the same time each day.

Quinidine is available as a conventional tablet and extended-release tablet.

If you are taking the extended-release type of tablet, swallow it whole. Do not chew or crush the tablet. Extended release tablets may be broken and split in half only if necessary.

This medicine must be taken regularly for it to be effective. Continue taking Quinidine even when you feel better. Do not stop taking it unless instructed by the doctor.
What should I do if I have forgotten to take this medicine?
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and return to your normal dosing schedule.

DO NOT double a dose under any circumstances.

If you often forget to take your medicine, let your doctor and pharmacist know.
When should I not use this medicine?
Alert your doctor if you have any of these conditions:

- complete heart block without a pacemaker (artificial device for regulating heartbeat)
- history of blood disorder (e.g. excessive bruising and bleeding) developed during prior treatment with quinidine and related drugs such as quinine
- myasthenia gravis (muscle weakness disorder)
as this medicine may not be suitable for you.
What should I take note of while taking this medicine?
Inform your doctor if you have the following conditions:

- heart failure
- G6PD deficiency (an inherited blood disorder that affects the red blood cell)
- liver disease
- kidney disease

Let your doctor know if you are pregnant or breastfeeding.

For as long as you are taking this medicine, you may need to have regular blood tests(e.g. complete blood count, liver and kidney function tests) to check your body's response to the medicine. Your doctor will advise you about how often you need to have blood tests.
What side effects could I experience?
Quinidine may cause any of the following side effects: stomach discomfort, nausea, vomiting, diarrhoea, rash, light headedness, chest pain, palpitations, headache, tiredness and weakness.

Some side effects may need immediate medical help. Alert your doctor quickly if you experience any of the following:

- blurred vision, ringing in the ears
- yellowing of the skin or eyes
- unusual bleeding or bruising
- new or worsened abnormal heart rhythm
- fainting

Inform your doctor if any of these side effects do not go away or are severe, or if you experience other side effects.
Can I take this with other medicines?
Inform your doctor and pharmacist if you are taking any of these medicines:

- other medicines used to treat abnormal heart rhythm e.g. amiodarone, verapamil
- medicines for TB (lung infection known as tuberculosis) e.g rifampicin
- antibiotics e.g. clarithromycin, erythromycin
- medicines for fungal infections e.g. ketoconazole, itraconazole
- medicines for epilepsy (fits or seizure) e.g. phenobarbital, phenytoin
- medicines for heart disease and high blood pressure e.g. propranolol, digoxin, nifedipine
- medicines for myasthenia gravis (muscle weakness disorder) e.g. pyridostigmine, neostigmine
- warfarin ( blood-thinning medicine)

This list does not include all medicines that may interact with Quinidine.

Always notify your doctor and pharmacist if you are taking any other medicines, including herbal tonics such as traditional Chinese medicines, supplements and medicines that you buy without a prescription.
What special dietary instructions should I follow?
Avoid alcohol and excessive consumption (more than 1 litre a day) of grapefruit juice.
How should I store this medicine?
Store in a cool, dry place away from the reach of children.

Medicines must not be used past the expiry date.

This information is independently developed by MIMS based on quinidine - oral and is provided for your reference only. It is not a replacement for and should only be used in conjunction with full consultation with a licensed healthcare professional, the information provided by your pharmacist and/or the manufacturer of the medication. It may not contain all the available information you require and cannot substitute professional medical care, nor does it take into account all individual circumstances. Although great effort has been made to ensure content accuracy, we shall not be held responsible or liable for any claims or damages arising from the use or misuse of the information contained herein, its contents or omissions, or otherwise. Copyright © 2024 MIMS. All rights reserved. Powered by MIMS.com
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