Written by:

PetMD Editorial
Published: November 07, 2012

Drug Info

  • Drug Name: Furosemide
  • Common Name: Lasix®, Salix®
  • Drug Type: Diuretic
  • Used For: Congestive Heart Failure
  • Species: Dogs, Cats
  • Administered: Injectable, Oral liquid, 12.5 mg, 20 mg, 40 mg, 50 mg and 80 mg tablets
  • How Dispensed: Prescription only
  • FDA Approved: Yes

What Is Furosemide for Dogs and Cats?

Furosemide is a drug used to prevent fluid build-up in the lungs or abdomen in pets with congestive heart failure, liver disease, or kidney disease.

Make sure your pet has plenty of water to drink when they are on this drug. Closely monitor your pet for signs of dehydration.

How It Works

Furosemide prevents a certain area of the kidneys from absorbing nutrients such as chloride, sodium, potassium and water. This removes excess fluids from your pet’s body and increases the amount and frequency of urination.

Storage Information

Store in a tightly sealed container at room temperature protected from light and heat.

Missed Dose?

Give the dose as soon as possible. If it is almost time for the next dose, skip the missed dose, and continue with the regular schedule. Do not give your pet two doses at once.

Side Effects and Drug Reactions

Furosemide may result in these side effects:

  • Dehydration
  • Increased water intake
  • Increased sensitivity to light
  • Lethargy
  • Restlessness
  • Increased heart rate
  • Tilting of the head in cats
  • Reduced ability to hear in cats
  • Vomiting
  • Diarrhea
  • Seizures
  • Loss of appetite

Furosemide may react with these drugs:

  • Corticosteroids
  • Other diuretics
  • Muscle relaxants
  • Drugs that may be toxic to the kidneys
  • Drugs that may be toxic to the ears
  • Aminophylline
  • Corticotropin
  • Digoxin
  • Insulin
  • Succinycholine chloride
  • Theophylline