Which of the following is a side effect of Dilantin?

Dilantin, also known as phenytoin, is an anticonvulsant medication primarily used to control seizures. It has a variety of side effects, and in this case, the inclusion of all the options under the umbrella of "all of the above" accurately reflects the multiple potential side effects that a patient may experience when taking the medication.

Nausea can occur as a gastrointestinal side effect of Dilantin, which may result from the way the drug interacts with an individual's body. Fatigue is another common adverse effect, often linked to the influence of the drug on the central nervous system. Dizziness, too, can arise from the sedative properties of Dilantin as well as the stabilization of electrical activity in the brain, which may lead to a feeling of lightheadedness in some patients.

Hence, recognizing that all listed symptoms—nausea, fatigue, and dizziness—are indeed side effects of Dilantin confirms that choosing the option specifying "all of the above" is the most comprehensive and accurate response. It encapsulates the spectrum of side effects that can occur, providing a broader understanding of the medication's effects.