What the FDA labels say about taking them together
Quinidine and stiripentol
Stiripentol's FDA label of April 27, 2026 names quinidine in its drug interactions section; the quinidine label PlainMeds reads does not name stiripentol. The stiripentol label: “Because of potential drug-drug interactions, consider dose adjustment of CYP1A2 substrates, CYP2B6 substrates, and CYP3A4 substrates, as clinically appropriate, when administered concomitantly with DIACOMIT.”
Check it at the source: the quinidine FDA label on DailyMed (effective February 1, 2018, Sun Pharmaceutical Industries, Inc.); the stiripentol FDA label on DailyMed (effective April 27, 2026, BIOCODEX, INC.).
What does the quinidine label say about stiripentol?
Quinidine's label (effective February 1, 2018) does not name stiripentol in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Quinidine Gluconate), Sun Pharmaceutical Industries, Inc., effective February 1, 2018 (SPL set 5023f053-fcc4-4c2c-aa59-9ec198ad185e), via openFDA; the full label on DailyMed
What does the stiripentol label say about quinidine?
Stiripentol label, drug interactionsBecause of potential drug-drug interactions, consider dose adjustment of CYP1A2 substrates (e.g., theophylline, caffeine), CYP2B6 substrates (e.g., sertraline, thiotepa), and CYP3A4 substrates (e.g., midazolam, triazolam, quinidine), as clinically appropriate, when administered concomitantly with DIACOMIT.
Source: FDA drug label (Diacomit), BIOCODEX, INC., effective April 27, 2026 (SPL set 58304ba8-9779-4658-811e-94ffe08c3f16), via openFDA; the full label on DailyMed
These are the labels' own sentences. PlainMeds does not grade interactions; a pharmacist or prescriber can say what they mean for one person's medicines.
Both medicines on the record
| Quinidine | Stiripentol | |
|---|---|---|
| Labeled for | Atrial fibrillation | n/a |
| Boxed warning | Yes | No |
| Pharmacy cost (NADAC) | $4.92 per tablet 324 mg tablet | n/a |
| Shortage now | No current entry | No current entry |
Source: FDA NDC Directory, CMS NADAC of October 7, 2026 and the FDA Drug Shortage Database (FDA files October 8, 2026)
What next?
- Check more medicines together
- up to five at once