Lasix & Diet

Lasix -- or furosemide -- is a type of loop diuretic prescription drug used to treat many conditions such as high blood pressure, fluid retention, kidney or liver disease, or other medical conditions. When taking Lasix, it is important to be aware of special dietary considerations to prevent side effects and excessive weight loss and to promote stable electrolytes.

A fresh vegetable salad. (Image: olgakr/iStock/Getty Images)

What Is Lasix?

Lasix causes the kidneys to excrete additional fluid and salt from the body through urine. This medication comes in either a tablet or liquid form and should be taken by mouth exactly as prescribed by your physician. Lasix is intended to control -- not cure -- high blood pressure, so continue using it unless your doctor recommends otherwise. Always inform your doctor of other prescription and nonprescription drugs you are taking before starting Lasix.

Side Effects

Lasix may cause headache, restlessness, cramps, nausea, vomiting, thirst, diarrhea or constipation. Other more severe side effects can include low blood pressure, dizziness, blurred vision, weakness or abnormal electrolytes. Be sure to call your doctor immediately if you have symptoms such as sore throat, fever, loss of hearing, difficulty breathing or severe unintentional weight loss.


Lasix should be taken on an empty stomach to improve absorption and effectiveness. However, if this causes stomach distress, you can also take Lasix with food or milk. Limit alcohol when taking Lasix and use caution if you are pregnant or lactating. Since Lasix is a potassium-depleting drug, your doctor may recommend that you follow a diet that is high in potassium and magnesium and possibly low in sodium.

Foods to Eat

Foods that are high in potassium include fruits, vegetables and certain juices. For example, prunes, tomato paste, bananas, raisins and orange juice are high in potassium. Foods that are high in magnesium include beans, nuts, whole grains and vegetables. For example, almonds, oatmeal, peanut butter and spinach contain significant amounts of magnesium. In general, aim to eat a healthy balanced diet that includes whole grains, lean meats, fruits, vegetables, low-fat dairy and healthy fats to provide adequate vitamins and minerals.


When taking Lasix, always follow dosage instructions and talk to your doctor if you experience side effects. Attend all scheduled appointments with your physician, as you will need blood pressure, lab tests and weight checks performed routinely.

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