Lasix (Furosemide)

Lasix (furosemide) is a loop diuretic, or water pill, used to reduce fluid buildup and lower blood pressure. It helps the kidneys remove extra water and salt through the urine. Doctors or healthcare providers typically prescribe it for swelling caused by heart failure, liver disease, or kidney disease. It’s also sometimes used to treat high blood pressure, either alone or with other medications.

Directions

Furosemide is usually taken by mouth at the same time each day as directed by a healthcare provider. For adults with edema, the typical starting dose ranges from 20 to 80 mg per day as a single dose. The dosage may be adjusted based on treatment response, with increases of 20 to 40 mg occurring no sooner than 6 to 8 hours after the previous dose.

If taken once daily, it's recommended to take furosemide in the morning after breakfast. When prescribed more than once per day, the last dose should be taken at least 6 hours before bedtime to reduce the urge to urinate at nighttime. For hypertension, the usual initial dose is 40 mg twice daily, although the dosage may be changed as necessary.

Ingredients

The active ingredient in Lasix is furosemide.

Cautions

Before using this medication, you may want to consult a healthcare provider about the following:

• Any existing health conditions
• Any allergies
• A list of all medications currently being taken

Lasix can cause changes in fluid and electrolytes, especially at higher doses. It’s important to monitor for dehydration, low blood pressure, dizziness, weakness, or heart rhythm problems.

People with liver disease, particularly cirrhosis with fluid buildup in the abdomen, may need to start Lasix in the hospital. Sudden changes in fluids or salts may worsen liver function and, in severe cases, trigger liver-related confusion or coma.

Lasix can worsen kidney function in some people. If urine output drops or kidney lab tests get worse, the medication may need to be stopped.

Hearing problems, including ringing in the ears or temporary or permanent hearing loss, have been reported, especially with high doses, rapid IV use, kidney disease, or when combined with certain antibiotics. Slow, controlled dosing lowers this risk.

Blood sugar levels may increase during treatment, and in rare cases Lasix can unmask or worsen diabetes. People with diabetes should monitor their glucose closely.

Men with prostate problems or anyone with trouble emptying their bladder may develop sudden urinary retention when starting Lasix and should be watched carefully.

Lasix may increase uric acid levels and can occasionally trigger gout attacks, even if symptoms were not present before.

People with low blood protein levels may not respond as well to Lasix and may be at higher risk for side effects, including hearing problems.

Contraindications

Avoid taking or using this medication if any of the following apply:

• Anuria (inability to produce urine)
• Hypersensitivity or allergic reaction to furosemide
• History of anaphylaxis to furosemide or related sulfonamide-based medications

Side Effects

Common side effects of Lasix include:

• Dizziness or lightheadedness
• Headache
• Blurred vision
• Nausea, vomiting, or diarrhea
• Muscle cramps or weakness
• Increased urination

These side effects are related to Lasix’s strong diuretic effects and changes in fluid and electrolyte balance. Dizziness can occur, especially when standing up quickly, and may be worse with alcohol use.

More serious side effects can include severe allergic reactions, hearing changes such as ringing in the ears or hearing loss, kidney inflammation, blood disorders, or severe skin reactions like Stevens-Johnson syndrome.

Lasix may also affect blood sugar, uric acid, or cholesterol levels and, in rare cases, cause liver or pancreatic problems. Seek medical help if you develop severe rash, hearing changes, signs of infection or bleeding, confusion, or persistent weakness.