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Before and while you are using quinidine, your doctor may prescribe other medications ("blood thinners"/anticoagulants such as warfarin, beta blockers such as metoprolol) to shrink any blood clots in the heart and to slow your pulse.
However, it may not stop all your irregular heartbeats completely.
Quinidine also helps to slow rapid heartbeats.
Quinidine can greatly improve your ability to perform normal activities by decreasing the number of irregular heartbeats you have.
Quinidine helps make your heart beat regularly.
Quinidine is an antiarrhythmic drug.
Quinidine is prescribed to treat certain types of malaria.
Quinidine is prescribed to treat or prevent many types of irregular heartbeats (heart arrhythmias such as atrial fibrillation).
Quinidine works by blocking abnormal heartbeat signals.

Side Effects

Quinidine side effects that you should report to your health care professional or doctor as soon as possible:
- Aburning feeling in throat or chest (heartburn);
- breathing problems;
- Change in the amount of urine;
- changes in vision;
- Chest pain;
- confusion;
- Dark urine;
- Diarrhea;
- Easy bruising/bleeding;
- Extreme tiredness;
- Eye pain;
- Fainting;
- feeling faint or lightheaded;
- fever;
- flushing of the skin with intense itching;
- headache;
- heartburn;
- irregular heartbeat;
- Itching/swelling (especially of the face/tongue/throat);
- Loss of appetite;
- Lupus-like symptoms (joint/muscle pain;
- Muscle pain;
- nausea, vomiting;
- Nausea;
- pain on swallowing;
- Persistent nausea/vomiting;
- Rash;
- ringing in the ears;
- Severe dizziness;
- skin rash, peeling or loose skin;
- Stomach pain/cramps;
- stomach pain;
- Sudden change in heartbeat (faster/slower/more irregular);
- Trouble breathing;
- Unexplained fever/signs of infection (persistent sore throat);
- unusual bruising or bleeding;
- Unusual sweating or shakiness (signs of low blood sugar);
- unusually weak or tired;
- Vision changes;
- Vomiting;
- Yellowing eyes/skin;


Quinidine is contraindicated if you have any of the following conditions:
- an unusual or allergic reaction to quinidine, quinine, other medicines, foods, dyes, or preservatives;
- breast-feeding;
- heart disease or previous heart attack;
- kidney disease;
- liver disease;
- low blood pressure;
- lung or breathing disease, like asthma;
- myasthenia gravis;
- pregnant or trying to get pregnant;
- you have a pacemaker;
- if you are allergic to quinidine;
- if you are allergic to quinine;
- if you have a certain blood disorder (g6pd deficiency);
- if you have any other allergies;
- if you have asthma;
- if you have certain medical conditions;
- if you have certain types of heart disease (incomplete or complete heart block without an artificial pacemaker, torsades-type irregular heartbeats, digitalis toxicity);
- if you have current infection with fever;
- if you have history of easy bruising/bleeding (thrombocytopenic purpura) with use of quinine or quinidine;
- if you have kidney disease;
- if you have liver disease;
- if you have severe muscle weakness (myasthenia gravis);
- if you have very low blood pressure;


Do not take Quinidine with any of the following drugs:
- abarelix;
- acetazolamide;
- amiloride;
- Amiodarone;
- amoxapine;
- Amprenavir/fosamprenavir;
- antacids;
- apomorphine;
- Arbutamine;
- Aripiprazole;
- arsenic trioxide;
- Atomoxetine;
- Azole antifungals;
- Barbiturates (phenobarbital);
- barbiturates, like phenobarbital;
- Carbamazepine;
- Carbonic anhydrase inhibitors (acetazolamide);
- certain antifungal medicines like itraconazole or ketoconazole;
- Certain HIV protease inhibitors;
- Certain macrolide antibiotics;
- cimetidine;
- Cisapride;
- Clarithromycin);
- Codeine;
- Diltiazem;
- diuretics;
- Dofetilide;
- droperidol;
- Erythromycin;
- Etravirine;
- haloperidol;
- hawthorn;
- Hydrocodone;
- Itraconazole;
- Ketoconazole;
- Large amounts of antacids (sodium bicarbonate);
- levomethadyl;
- Loperamide;
- Macrolide antibiotics (erythromycin);
- maprotiline;
- Medication for high blood pressure;
- medicines for high blood pressure or angina;
- medicines for malaria like chloroquine and halofantrine;
- medicines for mental depression such as tricyclic antidepressants;
- medicines for surgery that relax muscles or block pain;
- Mefloquine;
- Mesoridazine;
- methadone;
- methazolamide;
- Nelfinavir;
- Nifedipine;
- other medicines to control heart rhythm;
- pentamidine;
- phenothiazines like chlorpromazine, mesoridazine, thioridazine;
- Phenytoin;
- pimozide;
- script pain medicines like codeine and hydrocodone;
- Procainamide;
- Propafenone;
- Quinupristin/dalfopristin;
- ranolazine;
- Rifabutin;
- Rifampin;
- Rifamycins;
- Ritonavir;
- Saquinavir;
- sertindole;
- sodium bicarbonate;
- Sotalol;
- Thioridazine;
- vardenafil;
- Verapamil;
- Voriconazole;
- warfarin;
- Ziprasidone;


Reported Quinidine overdose symptoms are:
- Hallucinations;
- Severe dizziness/fainting;
- Seizures;
(c) 2017