Frusemide & Spironolactone Tablets

Generic Name:
Frusemide & Spironolactone Tablets
Therapeutic Category:
Antihypertensive / Dual-Mechanism Diuretic Combination
Mechanism of Action:
Synergistic fluid clearance. Frusemide is a loop diuretic that blocks the $Na^+/K^+/2Cl^-$ co-transporter in the loop of Henle, causing a powerful excretion of water, sodium, and potassium. Spironolactone is a potassium-sparing diuretic that competitively blocks aldosterone receptors in the distal renal tubules, promoting sodium excretion while retaining potassium.

Indications

Dosage & Administration

Contraindications & Precautions

Potential Side Effects

Indications (Therapeutic Uses)

This combination tablet is indicated for the management of fluid retention when single-diuretic therapy is insufficient or where maintaining potassium balance is critical:

  • Congestive Heart Failure Edema: To safely clear excessive fluid retention (edema) and alleviate breathing difficulties caused by pulmonary congestion, while minimizing the risk of diuretic-induced hypokalemia (low blood potassium).
  • Hepatic Cirrhosis with Ascites: First-line combination treatment to manage fluid accumulation in the abdominal cavity (ascites) and lower extremities caused by severe liver disease.
  • Nephrotic Syndrome: Management of stubborn edema associated with chronic renal disorders.
  • Essential Hypertension: Used as an adjunct treatment in cases where fluid retention contributes to high blood pressure and potassium stabilization is required.

Dosage & Administration

Website Note: Dosage must be individualized by a registered medical practitioner based on the patient’s fluid response, daily weight changes, and regular serum electrolyte monitoring.

  • Standard Dose: Commonly available in strengths such as 20mg/50mg or 40mg/50mg (Frusemide/Spironolactone). The typical dose is 1 to 2 tablets taken orally once daily.
  • Administration: Tablets must be swallowed whole with water. They should ideally be taken at a consistent time each day with breakfast or a main meal.
  • Timing: Avoid taking this medication late in the evening (typically past 6:00 PM) to prevent sleep disturbances caused by frequent nighttime urination (nocturia).

Contraindications & Precautions

  • Absolute Contraindications: Do not use in patients with known hypersensitivity to frusemide, spironolactone, or sulfonamide-derived drugs (sulfa allergies). Completely contraindicated in patients with anuria (complete absence of urination), acute renal failure, severe renal impairment (creatinine clearance less than 30 mL/min), Addison’s disease, or pre-existing hyperkalemia (high blood potassium).
  • Electrolyte Imbalances: While the two components work together to balance potassium, electrolyte shifts can still occur. Regular laboratory monitoring of serum potassium, sodium, uric acid, and creatinine is strongly recommended.
  • Hyperkalemia Risk: Spironolactone can cause dangerously high potassium levels, particularly in patients with kidney dysfunction, diabetes, or those using potassium supplements or salt substitutes containing potassium.
  • Ototoxicity (Hearing Alteration): High doses of frusemide can cause tinnitus or temporary hearing loss, especially when co-administered with other ototoxic drugs like aminoglycoside antibiotics.
  • Endocrine Disruptions: Spironolactone possesses anti-androgenic properties. Long-term use can lead to endocrine side effects including gynecomastia (breast enlargement in men), erectile dysfunction, and menstrual irregularities in women.

Potential Side Effects

  • Common / Mild: Increased frequency of urination, dizziness, headache, orthostatic hypotension (dizziness upon standing up), muscle cramps, nausea, diarrhea, and mild lethargy.
  • Less Common / Severe: Profound hyperkalemia or hyponatremia, gynecomastia, acute kidney injury, temporary hearing loss/tinnitus, worsening of gout (due to hyperuricemia), and severe cutaneous hypersensitivity reactions (such as Stevens-Johnson syndrome).
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