Canadian Practical Nurse Registration Examination (CPNRE) 2025 – 400 Free Practice Questions to Pass the Exam

Lasix, also known as furosemide, is a loop diuretic commonly used to treat conditions such as heart failure and edema. One of the well-known effects of Lasix is that it promotes the excretion of sodium and water through the kidneys, which can lead to significant loss of potassium as it increases urine output. This mechanism can result in hypokalemia, a condition characterized by low levels of potassium in the blood.

Potassium is essential for many bodily functions, including muscle contraction, nerve transmission, and maintaining a stable heartbeat. When potassium levels drop due to the effects of Lasix, supplementation may be necessary to prevent complications such as muscle cramps, weakness, or even serious heart rhythm disturbances.

In contrast, while dehydration can occur as a side effect due to increased urination, it is not specific to potassium levels. Hypertension and hyperglycemia are not typically associated with Lasix use and do not directly relate to the need for potassium supplementation. Thus, hypokalemia is the primary concern that indicates the necessity for potassium supplementation when patients are on Lasix.