General Drug Information and Indications

Loop diuretic for pulmonary edema, congestive heart failure, exercise-induced pulmonary hemorrhage (EIPH) in horses; edema and ascites in dogs and cats. Loop diuretic (furosemide). Mechanism: inhibits Na-K-2Cl cotransporter (NKCC2) in thick ascending loop of Henle → prevents reabsorption of Na+, K+, Cl- → marked diuresis. Also venodilatory effect (reduces preload acutely). Powerful short-acting diuretic. Used for EIPH in horses: reduces pulmonary blood pressure/volume pre-exercise. Sulfonamide-derived. Key information Loop diuretic. Monitor electrolytes (hypokalemia, hyponatremia). Potentiates aminoglycoside nephrotoxicity and ototoxicity — avoid concurrent use. Dehydration risk. Store at room temperature. USEF withdrawal time: consult current rules.

How to Give this Medication

IV: administer slowly (over 1–2 min); rapid IV bolus can cause ototoxicity. IM or SQ: inject into large muscle mass. Oral tablets or solution: Administer orally. May be given with food to improve compliance and reduce GI upset. Administer with food to reduce GI adverse effects. or without. Horses (EIPH): administer IV 4 hrs before racing per regulatory requirements. Store at room temperature; protect from light. If a dose is missed Give the missed dose as soon as you remember. If the next dose is due within a few hours, skip the missed dose and resume the regular schedule. Never give a double dose.

Side Effects

Electrolyte imbalances: hypokalemia, hyponatremia, hypomagnesemia, hypochloremic metabolic alkalosis (most common — monitor electrolytes). Dehydration, prerenal azotemia with excessive diuresis. Ototoxicity with high doses or rapid IV injection. Hypercalciuria. GI: vomiting, anorexia. Thiamine depletion with prolonged use.

Precautions

For animals Monitor electrolytes (K+, Na+, Mg2+) and hydration. Hypokalemia risk — supplement potassium if needed. Ototoxicity with high doses or rapid IV infusion. Drug interaction: aminoglycosides (additive nephrotoxicity), NSAIDs (reduce diuretic effect). Horses: avoid over-diuresis before competition — compromises performance and health. Use with caution in pregnant animals. For people handling this medication Wash hands thoroughly with soap and water after handling. Avoid contact with eyes; if contact occurs, flush with water for 15 minutes and seek medical attention. Keep out of reach of children. If accidental ingestion occurs, contact Poison Control (1-800-222-1222). Loop diuretic — Wash hands thoroughly with soap and water after handling. after handling. Keep out of reach of children. Sulfonamide derivative — inform doctor if sulfa-allergic.

Overdose

Contact your veterinarian. Furosemide overdose causes dehydration, electrolyte loss, and kidney stress.

Furosemide Tab dosage forms

ProductStrengthFormSizeType
FUROSEMIDE TAB 20MG20 MGTablet1Commercial

Sources

This information is provided for educational purposes and is not a substitute for advice from your veterinarian. Source: Merck Veterinary Manual (merckvetmanual.com); Plumb's Veterinary Drug Handbook (Plumb, D.C., app.plumbs.com)