Quinidine and Succinylcholine interaction
Quinidine and Succinylcholine: both prescribing labels describe an interaction that usually calls for monitoring, a dose change, or spacing the doses.
Usually manageable with monitoring or a dose change. Tell your pharmacist you take both.
What the FDA labels say
From the Succinylcholine (QUELICIN) label · effective 2026-08-18
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…
…Blocking Action of QUELICIN Drugs that may enhance the neuromuscular blocking action of succinylcholine include: promazine, oxytocin, aprotinin, certain non-penicillin antibiotics, quinidine, β-adrenergic blockers, procainamide, lidocaine, trimethaphan, lithium carbonate, magnesium salts, quinine, chloroquine, isoflurane, desflurane, metoclopramide, and terbutaline.
From the Quinidine (Quinidine Gluconate) label · effective 2024-08-27
In addition, in vitro addition of quinidine to the serum of pregnant women reduces the activity of pseudo-cholinesterase, an enzyme that is essential to the metabolism of succinylcholine.
Quinidine potentiates the actions of depolarizing (succinylcholine, decamethonium) and non-depolarizing ( d -tubocurarine, pancuronium) neuromuscular blocking agents .
Taking more than these two? Interactions stack. Check your whole list at once; it stays in your browser.
Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.