What the FDA labels say about taking them together
Quinidine and succinylcholine
Quinidine's FDA label of February 1, 2018 names succinylcholine in its drug interactions section, and succinylcholine's label names quinidine too. The succinylcholine label: “DRUG INTERACTIONS Drugs that May Enhance the Neuromuscular Blocking Action of Succinylcholine: promazine, oxytocin, aprotinin, certain non-penicillin antibiotics, quinidine, β-adrenergic blockers, procainamide …”
Check it at the source: the quinidine FDA label on DailyMed (effective February 1, 2018, Sun Pharmaceutical Industries, Inc.); the succinylcholine FDA label on DailyMed (effective August 18, 2026, Hospira, Inc.).
What does the quinidine label say about succinylcholine?
Quinidine label, drug interactionsQuinidine potentiates the actions of depolarizing (succinylcholine, decamethonium) and non-depolarizing ( d -tubocurarine, pancuronium) neuromuscular blocking agents.
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 succinylcholine label say about quinidine?
Succinylcholine label, drug interactionsDRUG INTERACTIONS Drugs that May Enhance the Neuromuscular Blocking Action of Succinylcholine: promazine, oxytocin, aprotinin, certain non-penicillin antibiotics, quinidine, β-adrenergic blockers, procainamide, lidocaine, trimethaphan, lithium carbonate, magnesium salts, quinine, chloroquine, isoflurane, desflurane, metoclopramide, terbutaline, and drugs that reduce plasma cholinesterase activity.
Source: FDA drug label (QUELICIN), Hospira, Inc., effective August 18, 2026 (SPL set fb08161e-7711-406d-e7b3-ea4515c07983), 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 | Succinylcholine | |
|---|---|---|
| Labeled for | Atrial fibrillation | n/a |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | $4.92 per tablet 324 mg tablet | n/a |
| Shortage now | No current entry | A presentation being discontinued |
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