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Phenytoin — NCLEX Cheat Sheet

Therapeutic 10–20 mcg/mL

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👤 By the CinnaRN Clinical Content Team 🕐 Updated 2026-07-11 🏷️ Pharmacological Therapies 🔖 Free to read, print, and share

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Use this quick-reference guide to spot, treat, and prevent Phenytoin on the NCLEX. Keep it handy during review and on exam day!

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Key numbers

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Teaching points

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Notify / act now

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What to look for

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Therapeutic serum level is 10-20 mcg/mL; toxicity causes nystagmus, ataxia, and slurred speech.

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