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# Furosemide Tablets
## Overview
Furosemide is a potent loop diuretic used to treat 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 heart failure, liver cirrhosis, and renal disease
* Hypertension
## Adult Dosing
**Edema:**
* Initial dose: 20-80 mg orally once a day.
* Further doses: May be given in 6-8 hours if needed.
* Maintenance dose: 20-40 mg orally once or twice a day, adjusted based on response.
* Maximum daily dose for edema: 600 mg orally.
**Hypertension:**
* Initial dose: 40 mg orally once a day.
* Maintenance dose: Adjust based on response.
* Often used in combination therapy.
* Maximum daily dose for hypertension: Not well established, but typically does not exceed doses used for edema.
**Intermittent dosing:** Dosing every other day or for 4 consecutive days followed by 2 days off may be considered for some patients to minimize electrolyte losses.
## Pediatric Dosing
**Edema:**
* Dose: 1-2 mg/kg orally once a day.
* Maximum dose: 6 mg/kg/day in divided doses.
* Dosing typically initiated at the lower end and adjusted based on response and tolerance.
## Dose Adjustments
* **Renal Impairment:** Dose may need to be adjusted. In severe renal impairment, higher doses may be required, but response should be carefully monitored.
* **Hepatic Impairment:** Dose may need to be adjusted. Cirrhosis with ascites may require cautious titration due to increased risk of electrolyte imbalances and hepatic encephalopathy.
## Contraindications
* Anuria
* Known hypersensitivity to furosemide or sulfonamides (cross-sensitivity may occur).
* Severe electrolyte depletion (e.g., hypokalemia, hyponatremia).
## Adverse Effects
* **Electrolyte Imbalances:** Hypokalemia, hyponatremia, hypochloremia, hypomagnesemia, hypocalcemia.
* **Dehydration and Hypotension:** Especially with rapid diuresis.
* **Ototoxicity:** Hearing impairment or tinnitus, usually reversible and more common with rapid IV administration or high doses.
* **Hyperuricemia:** May precipitate gout.
* **Hyperglycemia:** Can occur, especially in patients with diabetes.
* **Dermatologic:** Photosensitivity, rash.
* **GI:** Nausea, vomiting, diarrhea, abdominal pain.
## Key Drug Interactions
* **Aminoglycosides and other ototoxic drugs:** Increased risk of ototoxicity.
* **Antihypertensives (e.g., ACE inhibitors, ARBs, beta-blockers):** Additive hypotensive effect.
* **Digoxin:** Increased risk of digoxin toxicity due to furosemide-induced hypokalemia.
* **Lithium:** Decreased renal clearance of lithium, increasing risk of lithium toxicity.
* **NSAIDs:** May reduce the diuretic and antihypertensive effects of furosemide.
* **Potassium-sparing diuretics (e.g., spironolactone, amiloride):** Can counteract potassium loss, but requires careful monitoring to avoid hyperkalemia.
* **Thiazide diuretics:** Additive diuretic and electrolyte-depleting effects.
## Monitoring
* **Electrolytes:** Serum sodium, potassium, chloride, magnesium, and calcium.
* **Renal function:** Serum creatinine and BUN.
* **Fluid balance:** Intake and output, weight.
* **Blood pressure:** Especially in patients treated for hypertension or those at risk for hypotension.
* **Hearing:** Assess for tinnitus or hearing loss, especially with high doses or prolonged therapy.
* **Blood glucose:** In diabetic patients.
* **Uric acid:** In patients with a history of gout.
## Clinical Pearls
* Administering furosemide in the morning can help minimize nocturia.
* Oral administration may be less effective than intravenous administration in patients with severe edema or malabsorption.
* Continuous intravenous infusion may be preferred over intermittent bolus doses in some patients to avoid fluctuations in serum electrolytes and diuresis.
* Be cautious when switching between oral and intravenous formulations, as bioavailability can vary.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the current prescribing information and relevant clinical guidelines for the most up-to-date and comprehensive details before making any clinical decisions.
