# Furosemide (Frusemide) 20mg > Furosemide 20mg Tablets B.P. (Vet) for Dogs & Cats  Furosemide Tablets 20mg are a loop diuretic used to treat oedema (swelling from fluid buildup) associated with cardiac insufficiency, renal dysfunction, and trauma in cats and dogs. It increases urine output, helping to remove excess fluid f... *Source: https://ashcroft4pets.co.uk/dog-medications/furosemide-frusemide/* **⚠️ This product should only be used under the guidance of a licensed veterinarian.** --- ### Furosemide Tablets are used for dogs and cats. Furosemide (formerly known as frusemide) is a highly effective loop diuretic commonly prescribed in veterinary medicine. It is primarily used to manage oedema (fluid retention) and ascites (abdominal fluid build-up) in dogs and cats associated with congestive heart failure, as well as certain liver and kidney disorders. Furosemide facilitates the removal of excess fluid by increasing urine volume . This process helps lower blood pressure and assists the body in clearing out excess salts and waste products efficiently. --- ### Mechanism of Action At a cellular level, Furosemide acts on the nephrons within the kidneys. It specifically inhibits the reabsorption of sodium, potassium, and chloride in the thick ascending limb of the loop of Henle. By preventing these electrolytes from being reabsorbed into the bloodstream, the medication ensures they—and the water that follows them—are excreted via urine. --- ### Key Considerations for Use - **Hydration:** Because it increases fluid loss, pets must have constant access to fresh water to prevent dehydration. - **Electrolyte Balance:** Prolonged use can affect potassium levels, so veterinary professionals often monitor them through routine blood tests. - **Dosage:** Always administered according to a specific weight-based prescription to ensure safety and efficacy. [Source](https://www.vmd.defra.gov.uk/ProductInformationDatabase/product/A003268) [PIL ](https://www.vmd.defra.gov.uk/ProductInformationDatabase/product/A003268)