Drug interactions
Magnesium sulfate + Succinylcholine
Severity: Moderate
Magnesium sulfate and Succinylcholine: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Parenteral magnesium sulfate can potentiate and prolong the neuromuscular blockade produced by succinylcholine. This may delay recovery of muscle strength and spontaneous breathing after surgery or in obstetric patients.
What this interaction means in plain words
Magnesium sulfate and Succinylcholine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Magnesium reduces presynaptic acetylcholine release and decreases endplate sensitivity, adding to neuromuscular blockade.
What to do
Monitor neuromuscular function with a nerve stimulator and titrate succinylcholine to effect, using reduced doses if needed. Ensure ventilatory support is available until full recovery.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Succinylcholine
Frequently asked questions
Can I take Magnesium sulfate with Succinylcholine?
MediHelp rates the interaction as moderate. Magnesium sulfate and Succinylcholine can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Parenteral magnesium sulfate can potentiate and prolong the neuromuscular blockade produced by succinylcholine. This may delay recovery of muscle strength and spontaneous breathing after surgery or in obstetric patients.
How serious is the interaction between Magnesium sulfate and Succinylcholine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor neuromuscular function with a nerve stimulator and titrate succinylcholine to effect, using reduced doses if needed. Ensure ventilatory support is available until full recovery.
What other medicines interact with Succinylcholine?
MediHelp also lists interactions of Succinylcholine with, for example, Amikacin, Bacitracin-neomycin-polymyxin, Capreomycin. The full list is on the Succinylcholine page.
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