Fusid 40 Plus Tablet

Overview

Fusid Plus Tablet (Furosemide 40 mg + Spironolactone 50 mg) is a fixed-dose combination diuretic offering the complementary actions of a potent loop diuretic and an aldosterone antagonist. Furosemide drives rapid fluid elimination via the loop of Henle, while spironolactone blocks aldosterone at the distal tubule, reducing potassium wastage. This combination is indicated for essential hypertension, congestive heart failure (CHF), hepatic cirrhosis with ascites, generalised oedema, and conditions of primary or secondary hyperaldosteronism where adequate diuresis requires both mechanisms.

Dosage and Administration

Adults: 1–2 tablets daily (40–80 mg furosemide + 50–100 mg spironolactone), taken preferably in the morning. The dose may be adjusted based on clinical response and renal function. For maintenance of CHF or cirrhotic ascites, the lowest effective dose should be used. Tablets should be swallowed whole with adequate fluid and may be taken with food to reduce gastric irritation. Avoid taking late in the evening to minimise nocturia.

Interaction

Combination with ACE inhibitors, ARBs, or potassium supplements markedly increases the risk of hyperkalaemia — monitor serum potassium levels closely. Digoxin toxicity may be enhanced by electrolyte disturbances; monitor digoxin levels. NSAIDs antagonise the diuretic and antihypertensive effect and may precipitate acute renal failure. Concurrent aminoglycosides increase ototoxicity risk. Lithium levels rise with furosemide-induced reduction in renal clearance.

Contraindications

Contraindicated in anuria, acute renal insufficiency, creatinine clearance below 30 ml/min, hyperkalaemia (serum potassium above 5.5 mmol/L), Addison's disease, hypersensitivity to furosemide, sulphonamides, or spironolactone. Should not be co-administered with other potassium-sparing diuretics or high-dose potassium supplementation without close monitoring.

Side Effects

Hyperkalaemia is the most serious adverse effect of the spironolactone component, especially in patients with renal impairment or on concurrent potassium-elevating drugs. Furosemide may cause hyponatraemia, dehydration, and postural hypotension. Other effects include nausea, muscle cramps, and elevated uric acid. Long-term spironolactone use may cause gynaecomastia, menstrual irregularities, and impotence.

Pregnancy and Lactation

Both components cross the placenta; spironolactone has demonstrated anti-androgenic effects in animal studies. Use during pregnancy only under strict medical supervision and only when benefits outweigh risks. Both furosemide and spironolactone are excreted in breast milk; breastfeeding should be discontinued during treatment.

Precautions and Warnings

Regular monitoring of serum electrolytes (potassium, sodium), renal function (BUN, creatinine), and blood pressure is essential. The balance between the kaliuretic effect of furosemide and the potassium-sparing effect of spironolactone requires individual dose titration. Use with caution in elderly patients, diabetics (glucose intolerance risk), and those with hepatic impairment. Avoid abrupt discontinuation in patients with CHF or cirrhosis.

Storage Conditions

Protect from light. Store in a cool, dry place. Keep out of reach of children.

Frequently Asked Questions

Q: Is Fusid Plus 40+50 mg suitable for long-term use?
A: Yes, it can be used long-term for conditions such as CHF and cirrhotic ascites, under regular medical supervision. Periodic electrolyte and renal function monitoring is essential to detect hyperkalaemia or electrolyte imbalance early and adjust the dose if needed.

Q: What should I do if I miss a dose of Fusid Plus?
A: Take the missed dose as soon as you remember, unless it is close to the time for your next dose — in that case, skip the missed dose and continue with your regular schedule. Do not double the dose to make up for a missed one. If you frequently forget doses, discuss reminder strategies with your pharmacist or physician.