Lasix® (Furosemide) Injection for Dogs and Cats

Furosemide Injection is a loop diuretic used in dogs and cats to reduce fluid buildup from heart disease and other causes of edema. It helps remove excess fluid through the kidneys and can rapidly ease breathing distress. CanadianInsulin provides Canadian pricing and ships to the US, with US delivery from Canada. If you pay without insurance, you can compare Furosemide Injection cost before you order.

What Furosemide Is and How It Works

Lasix® (furosemide) is a loop diuretic. It blocks sodium and chloride reabsorption in the ascending loop of Henle. This action increases urine output, lowers fluid in the lungs and abdomen, and reduces pressure on the heart. Veterinarians use Furosemide Injection for pulmonary edema, congestive heart failure, and other causes of clinically significant fluid overload in dogs and cats.

At CanadianInsulin, orders are filled by licensed Canadian pharmacies after we confirm a valid prescription with your clinic.

Furosemide Injection often works within minutes when given intravenously in a clinic. Your veterinarian may also give it intramuscularly or subcutaneously in certain cases. Treatment plans sometimes begin with injection for rapid effect, then transition to oral therapy to maintain control.

Who Furosemide Is For

Veterinarians prescribe Furosemide Injection for dogs and cats with conditions where fast diuresis is needed. This includes acute pulmonary edema, decompensated congestive heart failure, and some situations of significant effusion or fluid retention.

Pets with severe dehydration, advanced kidney failure, or known sulfonamide sensitivity may not be appropriate candidates. Caution is used in pregnant or nursing animals and in those with electrolyte imbalances or low blood pressure. Your veterinarian determines suitability based on exam, diagnostics, and treatment goals.

Dosage and Usage

Dosing is individualized by the veterinarian. It depends on species, weight, diagnosis, and clinical response. Furosemide Injection may be given intravenously for rapid onset, or intramuscularly or subcutaneously when appropriate. Your veterinarian monitors hydration status, electrolytes, and kidney function during treatment.

After stabilization, many pets move to oral furosemide or other heart medications for maintenance. Never change the dose or route without veterinary guidance. Report changes in breathing, appetite, drinking, urination, or energy to the clinic.

Strengths and Forms

Common presentations of Furosemide Injection include:

• 10 mg/mL concentration
• 20 mg/2 mL vials or ampules
• 40 mg/4 mL vials or ampules

Packaging may be single-use vials, ampules, or multi-dose vials depending on the supplier. Availability may vary. If you are comparing Furosemide Injection 10 mg/mL price, look at pack size and whether the vial is single-use or multi-dose, as this affects value.

Missed Dose and Timing

Most Furosemide Injection doses are given in-clinic. If your veterinarian has directed at-home injections and a dose is missed, ask your clinic for instructions. Do not double the next dose. If your pet seems distressed or is breathing harder than usual, seek veterinary care promptly.

Storage and Travel Basics

Store unopened vials or ampules at room temperature, typically 20–25°C, away from excessive heat and light. Keep vials in the original carton to protect from light. Do not freeze. Do not use the product if the solution becomes discolored, cloudy, or contains particles. Follow the label or your veterinarian’s guidance for any beyond-use dating after first puncture. When traveling, keep vials upright in a protective case and avoid temperature extremes.

For practical injection handling pointers, see our article on Baytril Injection for Cats. While it covers a different medicine, many safety principles for handling and disposal apply.

Benefits

• Rapid diuresis can relieve pulmonary edema and help ease breathing
• Flexible routes: IV for fast onset; IM or SC when appropriate
• Useful bridge from emergency stabilization to oral maintenance therapy
• Available in multiple vial and ampule sizes for dosing flexibility

These benefits align with approved labeling and standard veterinary practice for loop diuretics.

Side Effects and Safety

• Increased urination and thirst
• Dehydration if water intake is limited
• Electrolyte changes, including low potassium
• Reduced appetite or gastrointestinal upset
• Lethargy or weakness

Serious but less common risks include kidney effects, low blood pressure, and, rarely, hearing changes with very rapid high-dose IV use or with certain antibiotics. Report vomiting, severe lethargy, collapse, or reduced urine output to your veterinarian without delay. Regular monitoring of electrolytes and kidney values is part of safe use.

Drug Interactions and Cautions

• ACE inhibitors and other blood pressure medicines may enhance hypotensive effects
• NSAIDs can blunt diuretic response in some cases
• Digoxin sensitivity may increase with low potassium
• Aminoglycoside antibiotics raise ototoxicity and nephrotoxicity risk
• Other diuretics or corticosteroids may heighten electrolyte loss

Always share a full medication and supplement list with your veterinarian, including heart medicines, pain relievers, and over-the-counter products. Clinics often tailor electrolyte support and diet to reduce risks.

What to Expect Over Time

When given intravenously, Furosemide Injection often begins working quickly. Breathing effort may ease as fluid shifts. Your veterinarian will watch respiratory rate, oxygenation, hydration, and urine output in-clinic. After stabilization, many pets continue with oral therapy to maintain control of fluid and symptoms. Some pets transition to Furosemide Tablets along with other heart medicines, as guided by the clinic.

Compare With Alternatives

Furosemide Injection is the standard rapid diuretic in veterinary practice. For maintenance of chronic heart failure, veterinarians often combine therapies. Pimobendan, available as Vetmedin®, can improve cardiac function. In some dogs, benazepril plus spironolactone, available as Cardalis®, supports long-term management. Your veterinarian selects the regimen based on diagnosis and response.

Pricing and Access

If you want to buy Furosemide Injection online, you can review options with Canadian pricing and US shipping. You can compare Furosemide Injection 20 mg/2 mL vials, Furosemide Injection 40 mg/4 mL vials, and other pack sizes. Many customers compare Furosemide Injection vial price by concentration and pack count to match clinic plans. We also list ampules when available.

Order Furosemide Injection online from Canada for US delivery from Canada. Check Furosemide Injection cost, see any available discounts, and compare Furosemide Injection prices across sizes before checkout. If you are self-pay or out of pocket, you can view a cash price alongside other options. For category browsing, visit Pet Medications. If you are looking for periodic offers, review our Promotions page.

Availability and Substitutions

Supply can vary by vial size, ampule packaging, and manufacturer. If a requested presentation is unavailable, your veterinarian may suggest a different pack size or an oral option. Veterinary-labeled furosemide products, such as Salix®, may be considered for maintenance therapy when appropriate. Your clinic will advise on clinical substitutions and dose adjustments.

Patient Suitability and Cost Saving Tips

Furosemide Injection is intended for dogs and cats needing rapid diuresis under veterinary direction. It may not suit pets with severe dehydration, untreated electrolyte disorders, or advanced renal compromise. Clinics often run baseline labs and repeat monitoring to support safe use.

• Ask about multi-pack vials or ampules that match your treatment plan
• Consider transitioning to oral therapy once stabilized, if appropriate
• Coordinate refills to avoid urgent shipping or clinic emergencies
• Use clinic rechecks and lab panels to optimize dose and reduce waste
• If pricing matters, compare Canadian options and pack sizes for value

Questions to Ask Your Clinician

• What signs show my pet is responding to Furosemide Injection?
• Which route will you use today, and why?
• How will you monitor electrolytes, kidney values, and blood pressure?
• When should we transition to oral furosemide or add other heart medicines?
• Which side effects should prompt an urgent call or recheck?
• How should I store any vials dispensed for home use?

Authoritative Sources

• FDA DailyMed: Furosemide Injection
• Health Canada Drug Product Database
• FDA Drug Labeling Database

Ready to proceed? Start your request for Furosemide Injection with prompt, express shipping and US delivery from Canada.