What Foods to Avoid When Taking Furosemide

Furosemide, often known by the brand name Lasix, is a diuretic medication commonly used to treat fluid retention (edema) and high blood pressure. When using this medication, certain foods may interact with its effectiveness or cause adverse effects. In this article, we will examine what foods you should avoid or limit when taking furosemide.

High-Potassium Foods

Furosemide works by increasing the amount of salt and water that the kidneys remove from the blood. This process can also lead to the loss of other electrolytes, such as potassium. While potassium is crucial for heart function and muscle contraction, too much can be harmful, particularly in individuals with kidney disease or those taking certain medications.

Some people may need to take a potassium supplement or eat a potassium-rich diet. However, if your doctor has prescribed a potassium-sparing diuretic along with furosemide, you may need to limit high-potassium foods. Foods high in potassium include bananas, oranges, potatoes, spinach, and tomatoes.

Remember, the need for dietary potassium restriction varies among individuals, so it’s crucial to discuss this with your doctor.

Salt and Sodium-Rich Foods

While taking furosemide, it’s also recommended to follow a diet low in salt (sodium). Consuming too much sodium can counteract the effects of furosemide and lead to increased fluid retention. Sodium-rich foods include processed meats, canned soups and vegetables, fast food, and salty snacks.


Real licorice or licorice root can interact negatively with furosemide. Licorice has a compound called glycyrrhizin, which can exacerbate the electrolyte imbalance caused by furosemide, particularly by further lowering potassium levels. This could lead to dangerous heart rhythms. Therefore, it’s best to avoid eating large amounts of licorice when taking furosemide.


Alcohol can lower blood pressure and may enhance some of the side effects of furosemide, such as dizziness and fainting. Therefore, it’s recommended to limit or avoid alcohol while taking this medication.


Maintaining a balanced diet is an integral part of managing your health while taking furosemide. To ensure safety and effectiveness, it’s crucial to understand how certain foods might interact with this medication.

Keep in mind that everyone is different, and the effects of these foods can vary from person to person. It’s always a good idea to discuss your dietary habits and any concerns you may have with your healthcare provider or a registered dietitian. They can provide guidance tailored to your individual needs and conditions.

Remember, this article provides general advice, and it should not replace the professional medical advice from your healthcare provider.