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Furosemide by VetOne

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Furosemide Syrup 1%

Generic Name:


 General Description:

Furosemide is a diuretic (water pill) used in dogs and cats to remove excess body fluids, in conditions such as heart or lung disease. It may also be used to treat high blood pressure or help with regulation of electrolyte levels. While on this medication, ensure your pet has good access to drinking water as your pet will be thirsty and will need to urinate more frequently. Furosemide is available as tablets and as an oral liquid.

 What is this drug?
  • Furosemide is a diuretic (helps the body lose water via increased urine production)
  • Furosemide is given by mouth
 Reasons for prescribing:
  • Because this drug helps remove excessive fluids from the body, it is useful in the treatment of congestive heart failure, pulmonary edema, kidney disease, liver disease, false pregnancy and edema
  • To treat high blood pressure
  • To reduce excessive calcium or potassium levels
 What dogs/cats should not take this medication?
  • Dehydrated pets, pets having difficulty urinating or those with an electrolyte (ex. calcium or potassium) imbalance
  • Use with caution in pets with kidney or liver disease or diabetes
  • Pets with a history of calcium oxalate bladder stones
  • Pregnant and nursing pets
  • Pets known to have had an allergic reaction to furosemide or other sulfa drugs

Your pet will likely need to urinate within 30 minutes of taking furosemide. The drug peaks 1-2 hours after administration. Your pet will have to urinate more frequently than normal and accidents' are possible.

Give this medication with or without food.

Give medication as directed by your veterinarian. This medication is usually given one to three times daily .

Give the exact amount prescribed and only as often as directed. Missed doses reduce the effectiveness of therapy.

Ideally, give the medication at the same time daily.

Ensure your pet has plenty of food and fresh, clean drinking water while taking furosemide.

Furosemide may cause your pet's skin to be more sensitive to sunlight and sunburn may occur. Keep your pet out of the sun as much as possible.

 What if dose is missed?

If a dose is missed, give it as soon as you can. If it is time already for the next dose, skip the missed dose and go back to the normal schedule. Do not give two doses at the same time.

 What to tell/ask veterinarian before giving medication?

Talk to your veterinarian about:

  • When will your pet need to be rechecked
  • What tests may need to be performed prior to and during treatment with this drug
  • Risks and benefits of using this drug

Tell your veterinarian about:

  • If your pet has experienced side-effects on other drugs/products
  • If your pet has experienced digestive upset now or ever
  • If your pet has experienced liver or kidney disease now or ever
  • If your pet has experienced any other medical problems or allergies now or ever
  • All medicines and supplements that you are giving your pet or plan to give your pet, including those you can get without a prescription. Your veterinarian may want to check that all of your pet's medicines can be given together.
  • If your pet is pregnant or nursing or if you plan to breed your pet
 Storage and Warnings:

Store in a tight, light resistant, childproof container in a cool, dry place at room temperature away from heat and direct sunlight.

Keep this and all medication out of reach of children and pets. Call your physician immediately if you accidentally take this product.

Pet owners allergic to sulfonamides and/or other antibiotics should avoid handling this drug.

 Potential side effects:
  • As with any diuretic, the main side effects are increased thirst and urination
  • Electrolyte (salts) imbalances may occur. Your veterinarian may wish periodic blood testing to assess furosemide's effect on your pet.
  • High blood sugar levels (may not be a good choice for diabetic patients)
  • Weakness or lethargy could indicate potassium levels have dropped too low. Contact your veterinarian if your pet shows these effects.
  • Damage to nerves responsible for hearing (especially in cats). If you notice your pet exhibiting a loss of balance or a head tilt, notify your veterinarian immediately.
  • Humans with sulfonamide sensitivities have experienced allergic reactions to furosemide. This has not been reported in pets, but if your pet has a sulfonamide allergy, bring it to your veterinarian's attention.
  • Restlessness, nausea, vomiting, diarrhea, loss of appetite, itching, rash
  • Rare cases of anemia
  • Excessive thirst, fatigue, lack of urination, racing heartbeat
  • If you notice anything unusual, contact your veterinarian
 Can this drug be given with other drugs?
  • Yes, but possible interactions may occur with vasodilating heart medications (especially enalapril, benazepril and lisinopril). Your pet may need both types of drugs. To avoid problems, blood tests may be necessary.
  • Care should be taken if your pet is also taking aminogylcoside antibiotics, amphotericin B, corticosteroids (prednisone), curare and its derivatives, digitalis derivatives, insulin, NSAIDS (ex. aspirin, carprofen), phenothiazines (ex. acepromazine), probenecid or sulfinpyrazone.
  • If your pet is also taking theophylline, the dose may be reduced.
  • If your pet experiences any unusual reactions when taking multiple medications, contact your veterinarian

Contact your veterinarian immediately if pet consumes more than the prescribed amount.

 What else should I know?

Notify your veterinarian if your animal's condition does not improve or worsens despite this treatment.

As with all prescribed medicines, furosemide should only be given to the dog/cat for which it was prescribed. It should be given only for the condition for which it was prescribed. It is important to periodically discuss your pet's response to furosemide at regular check ups. Your veterinarian will best determine if your pet is responding as expected and if your pet should continue receiving furosemide.

 This is just a summary of information about furosemide. If you have any questions or concerns about furosemide or for the condition it was prescribed, contact your veterinarian.

(Lasix, Salix, Disal) 

Common Drug Name 

Common Brand Names 
Lasix, Salix, Disal 
Generic products are available. 

Store at room temperature in a tight, light resistant, childproof container. 

Furosemide is a diuretic used in many species to remove excess fluid from the body. Used to treat congestive heart failure, some other heart diseases, pulmonary edema (fluid in the lungs), certain kidney diseases, high blood pressure, high potassium level in the blood, ascites (fluid in the abdomen), and certain kinds of tissue edema (swelling). 

Dose and Administration 
Always follow the dosage instructions provided by your veterinarian. Dosage, frequency, and duration of treatment vary with each disease, disease severity, and response to treatment. If you have difficulty giving the medication, contact your veterinarian. 

May be given with or without food. 

If using the transdermal gel, apply to the skin as directed by your veterinarian. 

If you miss a dose, give it as soon as you remember.  If it is almost time for the next dose, skip the one you missed and go back to the regular schedule.  Do not give 2 doses at once. 

This medication should only be given to the pet for whom it was prescribed. 

Possible Side Effects
 May include dehydration with excessive thirst and increased or decreased urine production; or electrolyte imbalances (e.g., low sodium, potassium, or calcium), often with rapid heart rate, weakness, depression, vomiting, and restlessness. If you see any of these signs, contact your veterinarian immediately. 

Less commonly may see an increase in blood glucose (sugar) level; anemia, resulting in pale gums, tiredness, or weakness; a decrease in white blood cells, making the animal more susceptible to infections; and stomach or intestinal disorders, with vomiting or diarrhea.  

Cats: May affect hearing or balance, or cause a tilt of the head. 

Consult your veterinarian if you notice any of the above side effects. 

Animals who eat and drink normally are less likely to experience side effects. 

If your pet experiences an allergic reaction to the medication, signs may include facial swelling, hives, scratching, sudden onset of diarrhea, vomiting, shock, seizures, pale gums, cold limbs, or coma. If you observe any of these signs, contact your veterinarian immediately. 

Not for use in animals who are hyper­sensitive (allergic) to it or sulfa drugs (furosemide is chemically similar to some sulfa drugs). 

Furosemide will cause your pet to urinate more often. Your pet may have more “accidents” and need to go outside or use the litter box more. Use with caution in animals with kidney disease and diabetes mellitus. 

Do not use in animals with anuria (inability to produce urine), progressive kidney disease, electrolyte imbalances, water loss (dehydration), liver disease, diabetes mellitus, vomiting, or diarrhea. 

Do not use in pregnant or lactating animals (female animals nursing their young). 

Your pet needs to eat and drink well while taking furosemide or the risk of side effects increases. Contact your veterinarian, if your pet is not eating or drinking well. 

Consult with your veterinarian regarding the physical examinations and laboratory testing necessary prior to and during treatment with furosemide. 

Human Precautions 
People with hypersensitivities (allergies) to sulfa drugs should not handle furosemide, or wear gloves and use extreme caution if they do, since allergic reactions could occur just from contact. 

Drug, Food, and Test Interactions 
Consult your veterinarian before using furosemide with any other medications, including vitamins and supplements, corticosteroids (prednisone, prednisolone,methylprednisolone), amphotericin B, insulin, probenecid, sulfinpyrazone,gentamicin, other aminoslycoside antibiotics, digoxin, enalapril, theophylline, or NSAIDs such as aspirin, deracoxib (Deramaxx), etodolac (EtoGesic), meloxicam (Metacam), carprofen (Novox or Rimadyl), firocoxib (Previcox), tepoxalin (Zubrin), since interactions may occur. 

Signs of Toxicity/Overdose 
May include hearing loss, electrolyte imbalances, dehydration, lethargy, coma, seizures, heart failure/collapse, and kidney damage, with increased thirst and urination. 

If you know or suspect your pet has had an overdose, or if you observe any of these signs in your pet, contact your veterinarian immediately. 

Keep this and all other medications out of the reach of children and pets. 

This information may not cover all possible uses, directions, side effects, precautions, allergic reactions, drug interactions, or withdrawal times.  Always consult your own veterinarian for specific advice concerning the treatment of your pet. 



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