Frusal

# Frusal ## Overview - **Classification**: Loop Diuretic - **Mechanism**: Inhibits the reabsorption of sodium and chloride in the ascending limb of the loop of Henle, leading to increased excretion of water, sodium, chloride, and potassium. ## Primary Indications 1. **Edema** - Associated with congestive heart failure, renal disease, or hepatic cirrhosis. 2. **Hypertension** - As an adjunct when standard therapy is insufficient or fluid overload is present. 3. **Acute Pulmonary Edema** - For rapid diuresis in emergencies. ## Adult Dosing ### Standard Dosing **Edema** - **Dose**: **20-80 mg** - **Frequency**: Once daily or divided into 2-3 doses - **Route**: PO - **Max Dose**: **600 mg/day** (PO) - **Special Considerations**: May require titration based on patient response. **Hypertension** - **Dose**: **20-40 mg** - **Frequency**: Once daily or BID - **Route**: PO - **Max Dose**: **80 mg/day** (PO) **Acute Pulmonary Edema (IV)** - **Dose**: **20-40 mg** IV push over 1-2 minutes - **Frequency**: May repeat in 1-2 hours if needed - **Route**: IV - **Max Dose**: Typically **200 mg/single dose** ### Dose Adjustments - **Renal Impairment**: - CrCl **<30 mL/min**: Lower initial doses; monitor closely. - Anuria: Contraindicated. - **Hepatic Impairment**: Use with caution; increased risk of hepatic encephalopathy. - May require lower doses. - **Elderly Patients**: Start with lower doses (**20 mg PO**) due to increased sensitivity and potential for dehydration/electrolyte imbalances. ## Pediatric Dosing ### Neonates (0-28 days) - **Dose**: **0.5-2 mg/kg** - **Frequency**: Every 12-24 hours - **Maximum**: **6 mg/kg/day** (total) - **Special Notes**: Risk of nephrocalcinosis/nephrolithiasis. Use lowest effective dose. ### Infants (1-12 months) - **Dose**: **0.5-2 mg/kg** - **Frequency**: Every 8-24 hours - **Maximum**: **6 mg/kg/day** (total) ### Children (1-12 years) - **Dose**: **0.5-2 mg/kg** - **Frequency**: Once daily or BID - **Maximum**: **6 mg/kg/day** or **160 mg/day** (whichever is less) ### Adolescents (13-18 years) - **Dose**: Approach adult dosing, starting at **20 mg** PO. - **Maximum**: **160 mg/day** PO; **200 mg/single dose** IV. ## Safety Information ### Contraindications - **Absolute**: Anuria (lack of urine production). - **Absolute**: Hypersensitivity to Frusal or sulfonamides. - **Relative**: Severe electrolyte depletion (e.g., hyponatremia, hypokalemia). ### Common Adverse Effects - **Very Common (>10%)**: Dehydration, electrolyte imbalance (hypokalemia, hyponatremia, hypomagnesemia). - **Common (1-10%)**: Orthostatic hypotension, dizziness, increased urination, muscle cramps. - **Serious but Rare**: Ototoxicity (transient or permanent hearing impairment), Stevens-Johnson syndrome, blood dyscrasias. ### Key Drug Interactions - **Aminoglycosides**: Increased risk of ototoxicity and nephrotoxicity. Avoid concurrent use if possible. - **NSAIDs (e.g., ibuprofen)**: May reduce Frusal's diuretic effect and increase risk of renal toxicity. - **Digoxin**: Increased risk of digoxin toxicity due to Frusal-induced hypokalemia. Monitor K+ levels closely. - **Lithium**: Frusal decreases lithium excretion, increasing lithium toxicity risk. Monitor lithium levels. - **Corticosteroids**: Increased risk of hypokalemia. ## Monitoring & Follow-up - **Before Treatment**: Baseline electrolytes (Na, K, Mg, Ca), BUN, creatinine, fluid status, weight. - **During Treatment**: - Daily weights, fluid intake/output. - Electrolytes, BUN, creatinine: Within 1-2 days of initiation/dose change, then weekly/bi-weekly depending on stability. - Blood pressure, especially orthostatic. - **Clinical Signs**: Watch for signs of dehydration (thirst, dry mouth, decreased skin turgor), dizziness, muscle weakness, irregular heart beat (indicating electrolyte imbalance). ## Clinical Pearls - 💡 **Timing**: Administer in the morning to avoid nocturnal diuresis and sleep disturbance. If BID, give in morning and early afternoon. - 💡 **Electrolytes**: Counsel patients on symptoms of low potassium (muscle cramps, weakness) and consider potassium-rich foods or supplements. - 💡 **Volume Depletion**: Advise patients to rise slowly to prevent orthostatic hypotension. Monitor for dizziness. - 💡 **Food**: May be taken with food to reduce gastric upset. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.