Drug interactions
Fosphenytoin + Pancuronium
Severity: Moderate
Fosphenytoin and Pancuronium: 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 chronic phenytoin or fosphenytoin often show resistance to pancuronium, with shorter duration of blockade and higher dose requirements.
What this interaction means in plain words
Fosphenytoin and Pancuronium 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.
Fosphenytoin belongs to Central Nervous System; Pancuronium belongs to Musculoskeletal.
Why it happens
Chronic phenytoin exposure probably reduces neuromuscular blocker effect through receptor changes and increased hepatic clearance; the exact mechanism is uncertain.
What to do
Monitor with train-of-four and be prepared to give higher or more frequent pancuronium doses.
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 Pancuronium
Other interactions of Fosphenytoin
- Dronedarone + Fosphenytoin Contraindicated
- Fosphenytoin + Ledipasvir-sofosbuvir Contraindicated
- Fosphenytoin + Lorlatinib Contraindicated
- Fosphenytoin + Lurasidone Contraindicated
- Fosphenytoin + Ranolazine Contraindicated
- Fosphenytoin + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Fosphenytoin with Pancuronium?
MediHelp rates the interaction as moderate. Fosphenytoin and Pancuronium 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 chronic phenytoin or fosphenytoin often show resistance to pancuronium, with shorter duration of blockade and higher dose requirements.
How serious is the interaction between Fosphenytoin and Pancuronium?
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 with train-of-four and be prepared to give higher or more frequent pancuronium doses.
What other medicines interact with Pancuronium?
MediHelp also lists interactions of Pancuronium with, for example, Amikacin, Bacitracin-neomycin-polymyxin, Capreomycin. The full list is on the Pancuronium page.
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