Quinidine: uses, dosing, side effects & brands
Quinidine is a medicine sold in the U.S. under 4 brand and generic names. Below: what the FDA label says, every product that contains it, what the pills look like, and its recall record.
Key facts
- Available as
- Tablet · Tablet, extended release
- Sold as
- 4 products — Quinact, Quinidex and Quinidine Sulfate, and others
- Prescription?
- Prescription only
- Generic available?
- Yes
- What the pharmacy pays
- about $326 for a 30-count supply — not your price
Every quinidine product we track (4)
Same active ingredient — different manufacturer, form, price and FDA recall record. That last one is what our independent score measures.
| # | Drug | Rating | Type | Form | Generic? | Pharmacy pays | |
|---|---|---|---|---|---|---|---|
| 1 | Not yet rated | Prescription | Tablet | No data | — | View → | |
| 2 | Not yet rated | Prescription | Tablet | Generic | $326 | View → | |
| 3 | Not yet rated | Prescription | Tablet | Generic | $326 | View → | |
| 4 | Not yet rated | Prescription | Tablet | Generic | $326 | View → |
What quinidine pills look like
Imprint codes, colour and shape from the FDA’s labelling data. Match the imprint on your pill — or search any imprint.
Combination products containing quinidine
A combination is a different drug — different dosing, different warnings. It is listed here so you can find it, not so you can substitute it.
How long quinidine keeps
No quinidine label we read sets a separate limit for after opening, but they do specify how it must be stored — and the stability behind any date assumes those conditions.
Quinidine and breastfeeding
From LactMed, the US National Library of Medicine’s Drugs and Lactation Database — quoted, not rewritten.
Full LactMed record for quinidine: levels in milk, effects in breastfed infants, and the drugs it would consider insteadLimited information indicates that maternal doses of quinidine up to 1.8 grams daily produce low levels in milk and would not be expected to cause any adverse effects in breastfed infants, especially if the infant is older than 2 months. Exclusively breastfed infants should be carefully monitored if this drug is used during lactation, possibly including measurement of serum levels to rule out toxicity if there is a concern.
National Institute of Child Health and Human Development, record revised July 15, 2024. LactMed states its information is not a substitute for professional judgement.
What people report to the FDA about quinidine
The FDA Adverse Event Reporting System (FAERS) collects reports from patients and clinicians. It holds 1,853 reports naming quinidine, and the FDA flagged 96% of those reports as serious. The effects reported most often — leaving out reports about overdose, misuse or the condition being treated, which dominate the raw list for common medicines:
- fatigue28 reports
- amyotrophic lateral sclerosis24 reports
- dementia24 reports
- fall22 reports
- respiratory failure22 reports
- nausea21 reports
- depression20 reports
- atrial fibrillation18 reports
Read these as a signal, not a rate. A report does not mean quinidine caused the effect — anyone can file one, and many describe people taking several medicines for several conditions. Crucially there is no denominator: FAERS does not record how many people took the drug, so these counts cannot be turned into “X% of patients” — a bigger number often just means a more widely used or more talked-about drug. Duplicates exist, and publicity drives reporting. For what is actually established, read the FDA label.
Source: openFDA drug/event (FAERS), retrieved August 26, 2026.
Related calculators
Frequently asked questions
Can you take quinidine with other medicines?
It depends on the medicine. We check it against the FDA labels rather than guessing: our interaction checker searches each drug's own label for the other and quotes what it says, naming the section it came from. Run quinidine against whatever else you take — and remember that a label not naming a drug is not the same as that combination being safe.
What brand names is quinidine sold under?
We track 4 quinidine-containing products in the U.S.: Quinact, Quinidex, Quinidine Sulfate and Quinora. They are the same active ingredient; they differ in form, manufacturer, price and FDA recall record.
What forms does quinidine come in?
Across the brands we track, quinidine is currently marketed as tablet and tablet, extended release, per the FDA's National Drug Code Directory. Each form is dosed differently — follow the label for the exact product you were prescribed.
Is there a generic quinidine?
Yes. Our catalog lists 3 generic quinidine products alongside the brand versions. A generic has the same active ingredient and must meet the FDA's bioequivalence standard; it usually costs less. Ask your pharmacist which one your plan covers.
Cite this page
- APA
- pharmaranks. (2026, July 24). Quinidine: uses, dosing, side effects & brands. https://pharmaranks.com/drugs/quinidine
- MLA
- “Quinidine: uses, dosing, side effects & brands.” pharmaranks, 24 July 2026, https://pharmaranks.com/drugs/quinidine.
We summarise public FDA and NIH sources — for a clinical claim, cite the primary source we link to as well.
Sources: FDA openFDA drug label, National Drug Code Directory, and Enforcement (recall) database. This page reproduces public FDA data and is not medical advice. Dosing is set by your prescriber.
Read the full FDA label for quinidine on DailyMed (NIH) ↗.