Drug interactions
Phenytoin + Vecuronium
Severity: Moderate
Phenytoin and Vecuronium: 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
Patients on long-term phenytoin often show resistance to vecuronium, with a shorter duration of action and higher infusion requirements. Acute phenytoin exposure may instead potentiate blockade.
What this interaction means in plain words
Phenytoin and Vecuronium 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.
Phenytoin belongs to Central Nervous System; Vecuronium belongs to Musculoskeletal.
Why it happens
Chronic phenytoin appears to cause resistance through enzyme induction and altered receptor sensitivity, increasing vecuronium clearance.
What to do
Monitor neuromuscular function with train-of-four and increase vecuronium dose or infusion rate as required. Expect faster recovery than usual.
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 Vecuronium
Other interactions of Phenytoin
- Artemether / lumefantrine + Phenytoin Contraindicated
- Bictegravir + Phenytoin Contraindicated
- Cabotegravir + Phenytoin Contraindicated
- Doravirine + Phenytoin Contraindicated
- Elbasvir / grazoprevir + Phenytoin Contraindicated
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Phenytoin Contraindicated
Frequently asked questions
Can I take Phenytoin with Vecuronium?
MediHelp rates the interaction as moderate. Phenytoin and Vecuronium 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. Patients on long-term phenytoin often show resistance to vecuronium, with a shorter duration of action and higher infusion requirements. Acute phenytoin exposure may instead potentiate blockade.
How serious is the interaction between Phenytoin and Vecuronium?
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 train-of-four and increase vecuronium dose or infusion rate as required. Expect faster recovery than usual.
What other medicines interact with Vecuronium?
MediHelp also lists interactions of Vecuronium with, for example, Amikacin, Bacitracin-neomycin-polymyxin, Capreomycin. The full list is on the Vecuronium page.
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