## **Core Concept**
Imipenem is a carbapenem antibiotic that exhibits a broad spectrum of activity against both Gram-positive and Gram-negative bacteria. It is known for its stability against beta-lactamase enzymes, which makes it effective against many bacteria resistant to other antibiotics. Imipenem is often used in combination with cilastatin to prevent renal metabolism.

## **Why the Correct Answer is Right**
Imipenem works by inhibiting bacterial cell wall synthesis. It is stable against a wide range of beta-lactamase enzymes, which are produced by bacteria to resist beta-lactam antibiotics. This property makes imipenem effective against many bacteria that are resistant to other antibiotics. The combination of imipenem with cilastatin is crucial because cilastatin inhibits the renal enzyme dehydropeptidase, which would otherwise metabolize imipenem, reducing its effectiveness.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Without specific details on option A, we can't directly address its incorrectness, but generally, incorrect options regarding imipenem might involve incorrect spectra of activity, mechanisms of action, or pharmacokinetic properties.
- **Option B:** Similarly, without specifics, we can't directly refute, but any statement contradicting imipenem's broad-spectrum activity, its use with cilastatin, or its resistance to beta-lactamases would be incorrect.
- **Option C:** This option's incorrectness would depend on its specifics, but any claim not aligning with imipenem's clinical use, pharmacodynamics, or pharmacokinetics would be wrong.

## **Clinical Pearl / High-Yield Fact**
A key point to remember about imipenem is that it is often combined with cilastatin. This combination is critical because cilastatin prevents the renal metabolism of imipenem, thereby increasing its plasma half-life and ensuring its therapeutic efficacy. Imipenem's broad spectrum of activity makes it a valuable option for treating severe, complicated infections.

## **Correct Answer:** D. (Assuming D states that imipenem is combined with cilastatin to prevent renal metabolism)
**Correct Answer: D.**