Quinidine Oral Tablet, Extended Release 300Mg Drug Medication Dosage Information
show timeout overlay link

Your Session Is About to Expire

This online session is about to expire due to inactivity. Click Continue to return to page.

  • Weekly Ad

Quinidine: Oral tablet, extended release (300mg)

Also see:
  • Get answers to Frequently Asked Questions (FAQs)
  • Find other class related drugs
  • Find additional patient usage statistics

Visit Drug Summary Page
Drug Image file default-drug-image.png


What is this Medicine?

QUINIDINE (KWIN i deen) is an antiarrhythmic drug. It helps make your heart beat regularly. This medicine also helps to slow rapid heartbeats.

CVS Pharmacy Patient Statistics for Quinidine: Oral tablet, extended release(300mg)
Generic vs. Brand Name Usage*
*Brand contains same active ingredient but may not represent FDA-approved generic equivalent
Usage By Strength
In-Depth Information
Select a Medication

Quinidine Sulfate 300mg Extended-Release Tablet

NDC: 599115895
  • Prescription Required
  • Not a Controlled Drug
    (CSA Schedule)
  • FDA Approved




FDA approved for the following conditions:
Ventricular Tachycardia, Atrial Flutter, Paroxysmal Supraventricular Tachycardia (PSVT) Prophylaxis, Paroxysmal Supraventricular Tachycardia (PSVT), Atrial Fibrillation, Wolff-Parkinson-White (WPW) Syndrome

Quinidine Sulfate 300mg Extended-Release Tablet
Drug Image file DrugItem_1608.JPG
ESI Lederle Sub of Wyeth
Pill Identification: 59911 5895 
Shape: round
Color: white

Reported Side Effects for Quinidine Sulfate 300mg Extended-Release Tablet

Weakness Incidence:
2.0%*
Severity: MILD
Onset: DELAYED
Shaking Incidence:
2.0%*
Severity: MILD
Onset: EARLY
Upset Stomach Incidence:
3.0%*
Severity: MILD
Onset: EARLY
Headache Incidence:
3.0-7.0%*
Severity: MILD
Onset: EARLY
Lightheadedness Incidence:
3.0%*
Severity: MILD
Onset: EARLY
Abnormal Heart Rhythm Incidence:
3.0%*
Severity: SEVERE
Onset: EARLY
Vomiting Incidence:
3.0%*
Severity: MILD
Onset: EARLY
Skin Rash Incidence:
5.0-6.0%*
Severity: MILD
Onset: EARLY
Weakness Incidence:
5.0%*
Severity: MILD
Onset: EARLY
Fever Incidence:
6.0%*
Severity: MILD
Onset: EARLY
Tired Incidence:
7.0%*
Severity: MILD
Onset: EARLY
Rapid Heart Rate Incidence:
7.0%*
Severity: MODERATE
Onset: EARLY
Throat Inflammation Incidence:
22.0%*
Severity: MODERATE
Onset: DELAYED
Heartburn Incidence:
22.0%*
Severity: MILD
Onset: EARLY
Loose Stools Incidence:
24.0-35.0%*
Severity: MILD
Onset: EARLY
*This is an approximate aggregated range of reported side effects from clinical studies performed on this drug. Your experience with this drug may be different.
Daily Life Interactions for Quinidine Sulfate 300mg Extended-Release Tablet

Elements of your daily lifestyle may have an effect on the medications you are taking. Drug interactions can result in unwanted side effects, reduce the effectiveness of your medicine or possibly increase the action of a particular medicine.

Major Lifestyle Interaction
Grapefruit juice and Quinidine Sulfate 300mg Extended-Release Tablet(Quinidine Sulfate)
Grapefruit juice and Quinidine(Quinidine Sulfate)
Side effects from Quinidine may get worse if you take Grapefruit juice. Do not take Quinidine and Grapefruit juice together. Grapefruit juice can raise the level of Quinidine in the blood, which could increase the chance of side effects from Quinidine such as nausea/vomiting, a slow heart rate, or dizziness. Contact your prescriber immediately if you experience fainting or falling spells, palpitations, shortness of breath, or a change in your usual heart beat (fast, slow, or irregular heart beat) while taking Quinidine. Discuss with your health care provider why you should avoid grapefruit juice intake when taking Quinidine.
Pregnancy & Lactation Information
FIRST Trimester

Class C - Animal studies have shown an adverse effect and there are no adequate and well-controlled studies in pregnant women. OR No animal studies have been conducted and there are no adequate and well-controlled studies in pregnant women.

SECOND Trimester

Class C - Animal studies have shown an adverse effect and there are no adequate and well-controlled studies in pregnant women. OR No animal studies have been conducted and there are no adequate and well-controlled studies in pregnant women.

THIRD Trimester

Class C - Animal studies have shown an adverse effect and there are no adequate and well-controlled studies in pregnant women. OR No animal studies have been conducted and there are no adequate and well-controlled studies in pregnant women.

Lactation

Caution - Not enough information is available to rule out harm to infants when this drug is taken by nursing mothers.


Learning More About
Visit the Drug Summary page where you can:
  • Get answers to Frequently Asked Questions (FAQs)
  • Find other class related drugs
  • Find additional patient usage statistics
Learn More
Patient Experiences with Quinidine

Be the first to share your experience!

We want to help our customers stay educated about the medications they are taking. Submit your own observations and experiences to benefit others.

Average Scores
Easy to Take 
0 / 5
0 / 5
Works as Intended 
0 / 5
0 / 5
Tolerable 
0 / 5
0 / 5