**Core Concept**
Phenytoin sodium is a medication used to control seizures in patients with epilepsy. However, it can cause a severe cutaneous adverse reaction (SCAR) known as Stevens-Johnson syndrome (SJS) or toxic epidermal necrolysis (TEN) in some individuals. This condition requires prompt recognition and management to prevent further complications.

**Why the Correct Answer is Right**
The management of SJS/TEN involves immediate discontinuation of the offending medication, including phenytoin sodium. This is crucial in preventing further damage to the skin and other organs. The patient should be evaluated for respiratory compromise, and supportive care, including wound care and fluid management, should be initiated. Corticosteroids may be considered in patients with SJS/TEN to reduce inflammation.

**Why Each Wrong Option is Incorrect**
**Option A:**
Discontinuing the medication alone may not be sufficient, as it may not address the underlying condition and can lead to further complications.

**Option B:**
Increasing the dose of phenytoin sodium is contraindicated in this scenario, as it can worsen the condition and lead to further skin reactions.

**Option C:**
Switching to a different antiepileptic medication may be considered in some cases, but it is not the immediate course of action in a patient with SJS/TEN.

**Clinical Pearl / High-Yield Fact**
In patients with SJS/TEN, it is essential to promptly discontinue the offending medication and initiate supportive care, including wound care and fluid management, to prevent further complications.

**Correct Answer:** C. Switching to a different antiepileptic medication may be considered in some cases, but it is not the immediate course of action in a patient with SJS/TEN.