What the FDA labels say about taking them together
Nelfinavir and quinidine
Nelfinavir's FDA label of December 11, 2025 names quinidine in its contraindications section; the quinidine label PlainMeds reads does not name nelfinavir.
Check it at the source: the nelfinavir FDA label on DailyMed (effective December 11, 2025, AGOURON); the quinidine FDA label on DailyMed (effective February 1, 2018, Sun Pharmaceutical Industries, Inc.).
What does the nelfinavir label say about quinidine?
Nelfinavir label, contraindicationsDrug Class: Antiarrhythmics; Drugs Within Class That Are Contraindicated With VIRACEPT: Amiodarone, quinidine; Clinical Comment: Potential for serious and/or life-threatening cardiac arrhythmia.
Source: FDA drug label (VIRACEPT), AGOURON, effective December 11, 2025 (SPL set e72c2bc6-9462-4a2e-8e1d-b97592376cbd), via openFDA; the full label on DailyMed
What does the quinidine label say about nelfinavir?
Quinidine's label (effective February 1, 2018) does not name nelfinavir 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
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
| Nelfinavir | Quinidine | |
|---|---|---|
| Labeled for | HIV | Atrial fibrillation |
| Boxed warning | No | Yes |
| Pharmacy cost (NADAC) | n/a | $4.92 per tablet 324 mg tablet |
| 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