Macquin 500mg Tablet

Quinidine (500mg)

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Macquin 500mg Tablet is a medicine used to treat arrhythmia (abnormal heart rhythm). It restores normal heart rhythm by blocking abnormal electrical signals in the heart. This helps to maintain a regular and steady heartbeat.

Written By Dr. Lipika Khurana, PGDHHM, BDS,
Reviewed By Dr. Rajeev Sharma, MBA, MBBS,
Last updated on 23 Jan 2026 | 10:14 AM (IST)

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General Information

Contains

Quinidine (500mg)

Marketer

Torque Pharmaceuticals Pvt Ltd

Storage

Store below 30°C

The content is shown in English

Product introduction

Macquin 500mg Tablet should be taken regularly as advised by the doctor. You should take it with food and at a fixed time. This medicine should not be stopped abruptly without consulting the doctor as this can worsen your condition. Regular follow-up with your doctor is advised while using this medicine.

It may cause side effects like nausea, vomiting, low blood pressure, ringing in ear, headache and blurred vision. Your doctor may advise for regular monitoring of kidney function and blood sugar levels while you are taking this medicine.

This medicine may not be suitable for some people. You must inform doctor if you are suffering from any liver or kidney disease. Also let your doctor know about all the other medications that you are using regularly. This medicine is not usually recommended during pregnancy or breastfeeding, so always consult your doctor before taking it.

Uses of Macquin Tablet

Arrhythmia

Benefits of Macquin Tablet

Arrhythmia
Arrhythmia is a condition where the heart beats irregularly, too quickly, or too slowly, affecting its ability to pump blood efficiently. Macquin 500mg Tablet helps restore and maintain a normal heart rhythm, improving blood flow and reducing symptoms such as palpitations, fatigue, or dizziness. This supports healthy heart function and helps prevent complications related to abnormal heart rhythms.

Side effects of Macquin Tablet

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them

Common side effects of Macquin

Nausea
Vomiting
Ringing in ear
Abdominal pain
Orthostatic hypotension (sudden lowering of blood pressure on standing)
Headache
Hypoglycemia (low blood glucose level)
Dysphoria (state of generalized dissatisfaction with life)
Diarrhea
Visual impairment
Deafness

How to use Macquin Tablet

Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. Macquin 500mg Tablet should be taken with or after food.

How Macquin Tablet works

Macquin 500mg Tablet is an anti-arrhythmic medication. It works by blocking abnormal electrical signals in the heart to correct irregular heartbeat to a normal rhythm.

Quick tips

It may cause dizziness. Do not drive or perform activities require mental focus until you know how it affects you.
Do not start any medicine including prescription or over-the-counter medicines without informing your doctor, as they may alter Macquin 500mg Tablet levels in your body.
Your doctor may get blood tests done to check your sodium and potassium levels, kidney function, and lung function before starting treatment with this medicine.
Your doctor may regularly monitor blood sugar level while taking this medicine.
Inform your doctor if you experience slow or fast heart rate, chest pain, shortness of breath.
Inform your doctor if you are pregnant or planning to conceive or breastfeeding.
Do not stop taking medication suddenly without talking to your doctor.
You have been prescribed Macquin 500mg Tablet to treat irregular heart rhythm.
It may cause dizziness. Do not drive or perform activities require mental focus until you know how it affects you.
Do not start any medicine including prescription or over-the-counter medicines without informing your doctor, as they may alter Macquin 500mg Tablet levels in your body.
Your doctor may get blood tests done to check your sodium and potassium levels, kidney function, and lung function before starting treatment with this medicine.
Your doctor may regularly monitor blood sugar level while taking this medicine.
Inform your doctor if you experience slow or fast heart rate, chest pain, shortness of breath.
Inform your doctor if you are pregnant or planning to conceive or breastfeeding.
Do not stop taking medication suddenly without talking to your doctor.

Safety advice

Alcohol

CONSULT YOUR DOCTOR

It is not known whether it is safe to consume alcohol with Macquin 500mg Tablet. Please consult your doctor.

Pregnancy

CONSULT YOUR DOCTOR

The safety of Macquin 500mg Tablet during pregnancy has not been established. There are no adequate and well-controlled studies in pregnant women, and animal data on reproductive toxicity are insufficient. Your doctor will weigh the benefits and any potential risks before prescribing.

Breast feeding

CONSULT YOUR DOCTOR

Macquin 500mg Tablet may be unsafe to use during breastfeeding. Limited human data suggests that the drug may pass into the breastmilk and harm the baby. It should be used only if the expected benefit outweighs the potential risk. Please consult your doctor.

Driving

UNSAFE

Macquin 500mg Tablet may decrease alertness, affect your vision, or make you feel sleepy and dizzy. Do not drive if these symptoms occur.

Kidney

CAUTION

Macquin 500mg Tablet should be used with caution in patients with severe kidney disease. Dose adjustment may be needed.

Liver

CONSULT YOUR DOCTOR

There is limited data available on the use of Macquin 500mg Tablet in patients with liver disease.

Interaction with drugs

Taking Macquin with any of the following medicines can modify the effect of either of them and cause some undesirable side effects

Life-threatening

Amiodarone (Oral Route)

Do not consume Amiodarone with Quinidine.

Life-threatening

Aripiprazole (Oral Route)

Do not consume Aripiprazole with Quinidine.

Life-threatening

Escitalopram Oxalate (Oral Route)

Do not consume Escitalopram Oxalate with Quinidine.

Life-threatening

Pimozide (Oral Route)

Do not consume Pimozide with Quinidine.

Life-threatening

Haloperidol (Oral Route)

Do not consume Haloperidol with Quinidine.

Frequently asked questions

Does Macquin 500mg Tablet cause thrombocytopenia?

Yes. Macquin 500mg Tablet may cause thrombocytopenia. Consult your doctor immediately if you develop any symptoms of thrombocytopenia (easy/ excessive bruising, reddish-purple pinpoint-sized spots in skin, prolonged bleeding from cuts, bleeding from your gums or nose, blood in urine or stools)

Does Macquin 500mg Tablet cause constipation?

Macquin 500mg Tablet causing constipation is very rare. However, please consult your doctor if you experience such side effects

How does Macquin 500mg Tablet treat malaria?

Macquin 500mg Tablet interferes with malarial parasite's ability to digest hemoglobin and inhibits the spontaneous formation of betahematin (hemozoin or malaria pigment), which is a toxic product resulting from digestion of hemoglobin by parasites.

Fact Box

Chemical Class

Cinchona alkaloids

Habit Forming

Therapeutic Class

CARDIAC

Action Class

Class I Antiarrhythmics

References

Sampson KJ, Kass RS. Anti-Arrhythmic Drugs. In: Brunton LL, Chabner BA, Knollmann BC, editors. Goodman & Gilman’s: The Pharmacological Basis of Therapeutics. 12th ed. New York, New York: McGraw-Hill Medical; 2011. pp. 843-45.
Nattel S, Gersh BJ, Opie LH. Antiarrhythmic Drugs and Strategies. In: Opie LH, Gersh BJ, editors. Drugs for the Heart. 8th ed. Philadelphia, Pennsylvania: Elsevier Saunders; 2013. pp. 273-74.
Hume JR, Grant AO. Agents Used in Cardiac Arrhythmias. In: Katzung BG, Masters SB, Trevor AJ, editors. Basic and Clinical Pharmacology. 11th ed. New Delhi, India: Tata McGraw Hill Education Private Limited; 2009. pp. 237-38.
Briggs GG, Freeman RK, editors. A Reference Guide to Fetal and Neonatal Risk: Drugs in Pregnancy and Lactation. 10th ed. Philadelphia, PA: Wolters Kluwer Health; 2015. pp. 1186-87.
Quinidine gluconate. Philadelphia, Pennsylvania: Mutual Pharmaceutical Company, Inc.; 2009. [Accessed 20 Mar. 2019] (online) Available from:
Chaves RG, Lamounier JA. Breastfeeding and maternal medications. J Pediatr (Rio J). 2004;80(5 Suppl):S189-S198. [Accessed 19 Mar. 2019] (online) Available from:

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Disclaimer

Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: Torque Pharmaceuticals Pvt Ltd
Address: C-83, Industrial Area, Phase 7, Mohali, Punjab (INDIA) – 160055

Vendor Details

Country of origin: India

Lab tests offered by us

Why we need a prescription?

Macquin 500mg Tablet

Save more with additional offers

General Information

Contains

Marketer

Storage

Product introduction

Uses of Macquin Tablet

Benefits of Macquin Tablet

Side effects of Macquin Tablet

How to use Macquin Tablet

How Macquin Tablet works

Quick tips

Safety advice

Alcohol

Pregnancy

Breast feeding

Driving

Kidney

Liver

Interaction with drugs

Amiodarone (Oral Route)

Aripiprazole (Oral Route)

Escitalopram Oxalate (Oral Route)

Pimozide (Oral Route)

Haloperidol (Oral Route)

Frequently asked questions

Does Macquin 500mg Tablet cause thrombocytopenia?

Does Macquin 500mg Tablet cause constipation?

How does Macquin 500mg Tablet treat malaria?

Fact Box

Chemical Class

Habit Forming

Therapeutic Class

Action Class

References

Want to know more

Have issue with the content

Disclaimer

Marketer details

Vendor Details

Lab tests offered by us

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