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.Precautions: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.Federal law restricts this drug to use by or on the order of a licensed veterinarian.Overdoses can be very dangerous. Keep out of reach of children and animals. Signs of an overdose may include hearing loss, electrolyte imbalances, dehydration, lethargy, coma, seizures, heart failure/collapse, and kidney damage, with increased thirst and urination.Always follow the dosage instructions provided by your veterinarian. If you have difficulty giving the medication, contact 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 two doses at once.This medication should only be given to the pet for whom it was prescribed.Human PrecautionsPeople 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.