Which of the following is not a possible side effect of furosemide?

The correct answer identifies pulmonary edema as not being a side effect of furosemide. Furosemide is a loop diuretic commonly used to treat conditions like heart failure and hypertension by promoting diuresis, which helps to remove excess fluid from the body.

In clinical practice, furosemide effectively reduces pulmonary edema, which is the buildup of fluid in the lungs, often seen in patients with congestive heart failure. As such, pulmonary edema is not a side effect of the medication; rather, it is a condition that furosemide aims to alleviate.

In contrast, hypokalemia, dehydration, and electrolyte imbalance are indeed potential side effects associated with the use of furosemide. The medication increases urine output, which can lead to the loss of potassium (resulting in hypokalemia), excessive fluid loss (leading to dehydration), and disturbances in other electrolytes due to the diuretic action. This highlights the importance of monitoring patients for these side effects when they are prescribed furosemide.