
What You Need to Know About Furosemide/Frusemide
In this new article series, we’ll discuss some of the most common medications prescribed by veterinarians in Singapore. We’ll cover the diseases they treat, common side effects, storage, safety and other useful tips.
What is furosemide? Why was it prescribed to my pet?
Furosemide (sometimes spelled “frusemide”) is a medication that works on the kidneys to remove excess water from the body. It is most commonly prescribed to relieve fluid buildup associated with conditions such as heart failure and certain lung diseases.
What forms are available?
Furosemide is available in liquid and tablet forms, which are given by mouth. Always follow your veterinarian’s dosing instructions when giving medication to your pet.
Liquid forms
o Flusapex
o Generic
Lasix is a common branded form of furosemide
What side effects are there?
The main side effects of furosemide are increased urination and drinking. Provide your pet with more opportunities to urinate and always ensure fresh water is readily available.
Some pets may experience mild vomiting or diarrhoea.
Furosemide may affect kidney function or cause imbalances in electrolytes (salts). Your veterinarian may wish to monitor these parameters.
Very rarely, furosemide may affect the nerves that control hearing and balance.
Contact your veterinarian if you notice any of the following:
• Severe vomiting or diarrhoea
• Weakness
• Collapse
• Lack of urination
• Head tilt
• Loss of balance
When should furosemide be used very carefully?
Your veterinarian may take additional precautions if your pet:
• Has kidney disease, liver disease or diabetes
• Has any other condition which may predispose them to dehydration
• Is taking certain antibiotics, pain relievers, blood pressure medications, or medications that affect the immune system
Precautions may include measures such as closer monitoring or adjustments to medication doses. For advice specific to your pet, please consult your veterinarian.
When should furosemide not be used?
Your pet should not receive furosemide if they:
• Are allergic to it, or to similar medications (such as torsemide)
• Are (or could be) pregnant
What monitoring is required for pets on furosemide?
It is important to take your veterinarian’s advice and bring your pet for rechecks as needed.
Depending on your pet’s underlying condition, your veterinarian may wish to monitor:
• Kidney values in blood
• Electrolyte (salt) values in blood
• Blood pressure
• The number of breaths your pet takes per minute while asleep
Storage and safety
Keep all medications out of reach of children and pets. Furosemide should be stored in a cool, dry place away from light. Tablets may discolour with exposure to light; discoloured tablets should be discarded.
If you miss a dose, give it as soon as you remember. If it is close to the time of your pet’s next scheduled dose, skip the missed dose and give the scheduled dose. Afterwards, return to your pet’s regular dosing schedule.
Never give a double dose, even if you miss a dose. Contact your veterinarian if you know or suspect that your pet has received an overdose.
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