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# Furosemide (Lasix)
## Overview
Furosemide is a potent loop diuretic used to reduce edema associated with congestive heart failure, liver cirrhosis, and renal disease, including the nephrotic syndrome. It is also used to treat hypertension, alone or in combination with other antihypertensives.
## Primary Indications
* Edema due to congestive heart failure, liver cirrhosis, and renal disease.
* Hypertension.
## Adult Dosing
* **Edema:** Initial dose is typically 20-80 mg orally once daily. The dose can be titrated upwards by 20-40 mg every 6-8 hours as needed. The maximum daily dose is generally 600 mg, but may be higher in refractory cases under close medical supervision. Doses may be given once or twice daily.
* **Hypertension:** Initial dose is 40 mg orally twice daily. Doses can be adjusted based on response. The maximum daily dose is 400 mg.
* **Intravenous (IV) or Intramuscular (IM) Dosing:** For edematous conditions, initial dose is 20-40 mg IM or IV. Further doses may be administered every 2 hours. Higher doses may be needed in severe cases. For acute pulmonary edema, 40 mg IV.
## Pediatric Dosing
* **Edema and Hypertension:** 1-2 mg/kg/dose orally every 6-12 hours. Maximum dose: 6 mg/kg/day orally.
* **IV or IM Dosing:** 1 mg/kg/dose IV or IM every 6-12 hours. Maximum dose: 6 mg/kg/day IV or IM.
## Dose Adjustments
* **Renal Impairment:** Dose adjustments are often necessary due to reduced renal clearance. Increased frequency or dose may be required in some patients with renal insufficiency, but caution is warranted.
* **Hepatic Impairment:** Patients with hepatic cirrhosis may be more sensitive to the effects of furosemide and may develop hepatic coma. Lower doses are often initiated.
## Contraindications
* Anuria.
* Known hypersensitivity to furosemide or sulfonamides.
## Adverse Effects
Common adverse effects include dizziness, lightheadedness, orthostatic hypotension, hearing loss, tinnitus, abdominal discomfort, diarrhea, nausea, and rash. Electrolyte imbalances (hypokalemia, hyponatremia, hypochloremia) are significant concerns. Hyperuricemia, hyperglycemia, and increased LDL cholesterol have also been reported.
## Key Drug Interactions
* **Aminoglycosides:** Increased risk of ototoxicity.
* **ACE inhibitors/ARBs:** Increased risk of hypotension and renal dysfunction.
* **Corticosteroids:** Increased risk of hypokalemia.
* **Digoxin:** Increased risk of digoxin toxicity due to furosemide-induced hypokalemia.
* **NSAIDs:** May reduce diuretic and antihypertensive effects.
* **Lithium:** Reduced renal clearance, increasing lithium levels and risk of toxicity.
* **Warfarin:** May enhance the anticoagulant effect.
## Monitoring
* Electrolytes (sodium, potassium, chloride).
* Renal function (BUN, creatinine).
* Blood pressure.
* Urine output.
* Hearing acuity.
* Blood glucose and uric acid levels in susceptible patients.
## Clinical Pearls
* Furosemide is a potent diuretic; monitor fluid and electrolyte balance closely.
* Administering furosemide in the morning can help minimize nocturia.
* Oral and IV doses are not necessarily interchangeable on a mg-per-mg basis; IV doses are generally more potent and have a faster onset.
* In patients with heart failure, consider the potential for dose-related ototoxicity, especially with rapid IV administration or very high doses.
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*This information is intended for healthcare professionals. It is essential to consult the most current prescribing information and relevant clinical guidelines for complete details before making treatment decisions.*
