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## Furosemide (Lasix)
### Overview
Furosemide is a potent loop diuretic used to treat edema associated with heart failure, liver cirrhosis, and renal disease. It is also used to manage hypertension.
### Primary Indications
* Edema (pulmonary, peripheral) associated with congestive heart failure, liver disease, or renal disease.
* Hypertension (adjunctive therapy).
### Adult Dosing
* **Edema:**
* Oral: Initial dose 20-80 mg once daily. May increase by 20-40 mg every 6-8 hours as needed. Usual maintenance dose 40-80 mg once or twice daily.
* IV/IM: Initial dose 20-40 mg once daily. May increase by 20 mg every 2 hours as needed. Usual maintenance dose 40-80 mg once or twice daily.
* Maximum oral dose: 600 mg/day (higher doses may be used in rare cases under close supervision).
* Maximum IV/IM dose: 200 mg in a single dose (higher doses may be used in rare cases under close supervision).
* **Hypertension:**
* Oral: 40 mg twice daily. (Typically used in combination with other antihypertensives).
### Pediatric Dosing
* **Edema:**
* Oral: 1-2 mg/kg/dose once daily, not to exceed 6 mg/kg/day. Doses typically administered every 12-24 hours.
* IV/IM: 1 mg/kg/dose once daily, not to exceed 6 mg/kg/day. Doses typically administered every 12-24 hours.
* **Neonates:**
* Oral: 0.5-1 mg/kg/dose every 12-24 hours.
* IV/IM: 0.5-1 mg/kg/dose every 12-24 hours.
### Dose Adjustments
* **Renal Impairment:** Dose may need to be increased in patients with significant renal impairment due to decreased drug efficacy and accumulation. Monitor electrolytes and renal function closely.
* **Hepatic Impairment:** Use with caution. Dose adjustments may be necessary.
### Contraindications
* Anuria.
* Known hypersensitivity to furosemide or sulfonamides (caution with cross-reactivity).
### Adverse Effects
* **Electrolyte Imbalances:** Hypokalemia, hyponatremia, hypochloremia, hypomagnesemia, hypocalcemia.
* **Dehydration:** Excessive diuresis.
* **Ototoxicity:** Tinnitus, hearing impairment (especially with rapid IV administration or high doses).
* **Hyperuricemia/Gout:**
* **Hyperglycemia:**
* **Photosensitivity:**
* **Dizziness, lightheadedness:**
### Key Drug Interactions
* **Aminoglycosides, Cisplatin:** Increased risk of ototoxicity.
* **Other Ototoxic Drugs:** Increased risk of ototoxicity.
* **ACE Inhibitors/ARBs:** Increased risk of hypotension and renal dysfunction.
* **NSAIDs:** May reduce diuretic and antihypertensive effects.
* **Lithium:** Increased risk of lithium toxicity.
* **Potassium-Sparing Diuretics/Potassium Supplements:** Use with caution to avoid hyperkalemia.
* **Corticosteroids:** Increased risk of hypokalemia.
### Monitoring
* Electrolytes (serum potassium, sodium, chloride, magnesium, calcium)
* Renal function (BUN, creatinine)
* Blood pressure
* Urine output
* Hearing (if experiencing tinnitus or hearing loss)
* Blood glucose (in diabetic patients)
* Uric acid levels
### Clinical Pearls
* Administer oral furosemide in the morning to minimize nocturia.
* For IV administration, dilute and infuse slowly to reduce the risk of ototoxicity. Avoid rapid infusion.
* Monitor for signs of dehydration and electrolyte imbalances, especially in elderly patients or those with significant fluid losses.
* Potassium supplementation is often required with chronic furosemide use.
* Effectiveness can be reduced in patients with significant renal impairment; higher doses may be required.
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*This information is intended for healthcare professionals. It is essential to consult the official prescribing information and relevant clinical guidelines for the most up-to-date and complete information before making any treatment decisions.*
