## **Core Concept**
Amphotericin B is a polyene antifungal medication used to treat serious fungal infections. It works by binding to ergosterol in fungal cell membranes, creating pores that lead to cell death. However, its administration is often associated with infusion-related reactions.

## **Why the Correct Answer is Right**
The correct answer, **C. Diphenhydramine**, is a strategy to prevent or mitigate infusion-related reactions to amphotericin B, which can include fever, chills, rigors, and potentially life-threatening anaphylaxis. Diphenhydramine, an antihistamine, can help alleviate these symptoms by blocking histamine release associated with the infusion. Premedication with diphenhydramine, along with other measures like administering the drug at a low initial dose and gradually increasing it, helps reduce the severity of these reactions.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because premedication with a corticosteroid might be considered in some cases to reduce inflammation but is not the most direct approach to manage acute infusion reactions associated with amphotericin B.
- **Option B:** This option is incorrect as there is no commonly recommended premedication specifically noted for its utility in preventing amphotericin B infusion reactions under this choice.
- **Option D:** This option is incorrect because, while hydration is crucial in preventing nephrotoxicity associated with amphotericin B, it does not directly address the infusion-related reactions.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that patients receiving amphotericin B should be premedicated with agents like **diphenhydramine** and **acetaminophen** to reduce the risk of infusion-related reactions. Additionally, monitoring renal function is crucial due to the drug's nephrotoxic potential.

## **Correct Answer:** C. Diphenhydramine