Torsemide

Key facts

• Torsemide is a loop diuretic, sometimes called a water tablet, that makes the kidneys pass more sodium, water, and other electrolytes out in the urine, reducing fluid buildup and easing strain on the heart.
• It is usually taken once daily, often in the morning to avoid needing the bathroom at night, and increased urination starts within an hour.
• Torsemide can lower potassium, sodium, and magnesium levels. Regular blood tests check electrolytes and kidney function, since low potassium can trigger dangerous heart rhythms.
• Seek urgent care for muscle cramps with weakness, a fast or irregular heartbeat, confusion, or signs of severe dehydration.

What torsemide treats

Torsemide treats fluid overload (edema) caused by heart failure, kidney disease, and liver disease, reducing swelling in the legs, abdomen, and lungs. It is also used to treat high blood pressure. It does not treat the underlying heart, kidney, or liver disease, only the fluid buildup it causes.

How torsemide works

The kidneys normally reabsorb sodium and water as blood filters through them. Torsemide blocks the transporter responsible for that reabsorption in a part of the kidney called the loop of Henle, so more sodium, water, and other electrolytes such as potassium pass into the urine instead of returning to the bloodstream.

Before you take it

• Tell your prescriber about kidney or liver disease, gout, diabetes, or an allergy to sulfonamide medicines, since torsemide is chemically related to sulfa drugs.
• Tell your prescriber about other medicines you take, including other diuretics, ACE inhibitors, lithium, NSAIDs, and digoxin. Torsemide can change how these work and how they affect your electrolytes.
• Torsemide increases urination; plan doses so you are not caught away from a toilet, and tell your prescriber if you feel excessively dehydrated.
• Your prescriber will check blood potassium, sodium, magnesium, and kidney function before starting and periodically during treatment.

Side effects

Common effects include increased urination, dizziness on standing, headache, and dry mouth.

Stop and seek urgent medical care for any of these:

• Muscle cramps, weakness, or an irregular heartbeat, which can signal low potassium or magnesium.
• Severe dehydration: extreme thirst, very dark urine, or confusion.
• Significant dizziness, fainting, or a rapid heartbeat from a large drop in blood pressure.
• Signs of a severe allergic reaction: rash, facial swelling, or difficulty breathing.

Safety essentials

• Torsemide depletes potassium and other electrolytes, which can cause dangerous heart rhythm problems if uncorrected; regular blood tests are needed to catch this before symptoms appear.
• Tell your prescriber if you develop vomiting, diarrhea, or reduced fluid intake, since dehydration on top of a diuretic raises the risk of kidney injury and electrolyte imbalance.
• Avoid excess alcohol, which adds to the blood-pressure-lowering and dehydrating effects.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.